Intermediate Python

1. List

Oredered, mutable, allows duplicate items & different data types

Creating

print("1.1 using [] - list constructor")
a1=["banana","cherry","apple"]
a2=["banana",2,True,'a']
a3=["a","a"*2,"a"*3]    # output: ['a', 'aa', 'aaa']

a20=[20]*10
a21=[1]*10
a22=a20+a21

print(a1,a2,a3,a20,a21,a22,"\n")

print('''1.2 using "list()"''')
a4=list(a1)
a5=list(range(1,6))
a6=list("janav makkar") # output: ['j', 'a', 'n', 'a', 'v', ' ', 'm', 'a', 'k', 'k', 'a', 'r']
a7=list()
a8=list(["ab","bc","cd"])

print(a4,a5,a6,a7,a8,"\n")

print("1.3 using list comprehensions")
a9=[1,2,3,4,5,6,7,8,9,10]

a10=[i for i in a9 if i%2==0]
a11=[i**2 for i in a9]
a12=[i*12 for i in range(11,20)]

print(a10, a11, a12,"\n")

### Accessing
print("2.1 Index values")
print(a9[0])
print(a9[1])
print(a9[-10])
print(a9[9])
print(a9[-1],"\n")

print("2.2 Slicing")
print(a10[1:6])
print(a10[5:])
print(a10[:5])
print(a10[1:-2])
print(a10[:],"\n")

print("2.3 Step Slicing")
print(a10[0:6:2])
print(a10[:6:2])
print(a10[3::2])
print(a10[10:2:-1], "\n")

print("2.4 for loop")
for i in a10:
    print(i)

### Methods
print("3.1 ADD METHODS")    # .insert(), .extend(), .append()
a13=list(range(1,6))
a14=list(range(6,11))
print(a13,a14,"\n")

a13.insert(0,120) # .insert(index,value) - inserts value at given index
print(a13)

a13.extend(a14) # .extend(list) - joins list at the back
print(a13)

a13.append(11) # .append(value) - adds the value at the back
print(a13,"\n")

print("3.2 DELETE METHODS")       # .pop(), .remove(), .clear()
a15=list(range(1,11))
print(a15)

a15.pop() # .pop() - removes last value
print(a15)

a15.pop(1) # .pop(index) - removes value at given index
print(a15)

a15.remove(4) # .remove(value) - removes first occurence of the value
print(a15)

a15.clear() # .clear() - clears whole list
print(a15,"\n")

print("3.3 OTHER METHODS") # .sort(), .reverse(), .index(), .count()
a16=[11,44,23,9,1,87,56,31,10,27,64,11,11,11]
print(a16)

a16.sort() # .sort() - modifies original list
print(a16)

a16.reverse() # .reverse() - modifies original list
print(a16)

a17=a16.index(87) # .index() - returns index of first occurence of the given value
print(a17)

a18=a16.count(11) # .count() - returns number of times value in the list
print(a18,"\n")

print("4. Functions - len(), min(), max(), sum(), sorted()")
print(len(a9), min(a9), max(a9), sum(a9)) # len(*) - returns length of list, min(*), max(*), sum(*) - only works for numeric lists
a19=sorted(a16) # sorted(*) - does not modify original list
print(a19,"\n")

### Etc

print('5.1 "in" operator')
a=2 in a9
b="gold" in a1
print(a,b,"\n")

print("5.2 COPY METHODS") # =, .copy(), [:], list()
a23=[1,2,3,4,5,6,7,8,9,10]
a24=a23
a24.append(11)
print(a23,a24,"\n")  # this happens because a24 is just a reference to a23, actual copy does'nt takes place

print("5.3 Actual copy methods")
a25=a23.copy() # .copy()
a25.append(12)
print(a23,a25,"\n")

a26=a23[:] # [:]
a26.append(13)
print(a23,a26,"\n")

a27=list(a23) # list()
a27.append(14)
print(a23,a27,"\n")

1.1 using [] - list constructor
['banana', 'cherry', 'apple'] ['banana', 2, True, 'a'] ['a', 'aa', 'aaa'] [20, 20, 20, 20, 20, 20, 20, 20, 20, 20] [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]

1.2 using "list()"
['banana', 'cherry', 'apple'] [1, 2, 3, 4, 5] ['j', 'a', 'n', 'a', 'v', ' ', 'm', 'a', 'k', 'k', 'a', 'r'] [] ['ab', 'bc', 'cd']

1.3 using list comprehensions
[2, 4, 6, 8, 10] [1, 4, 9, 16, 25, 36, 49, 64, 81, 100] [132, 144, 156, 168, 180, 192, 204, 216, 228]

2.1 Index values
1
2
1
10
10

2.2 Slicing
[4, 6, 8, 10]
[]
[2, 4, 6, 8, 10]
[4, 6]
[2, 4, 6, 8, 10]

2.3 Step Slicing
[2, 6, 10]
[2, 6, 10]
[8]
[10, 8]

2.4 for loop
2
4
6
8
10
3.1 ADD METHODS
[1, 2, 3, 4, 5] [6, 7, 8, 9, 10]

[120, 1, 2, 3, 4, 5]
[120, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
[120, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

3.2 DELETE METHODS
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[1, 3, 4, 5, 6, 7, 8, 9]
[1, 3, 5, 6, 7, 8, 9]
[]

3.3 OTHER METHODS
[11, 44, 23, 9, 1, 87, 56, 31, 10, 27, 64, 11, 11, 11]
[1, 9, 10, 11, 11, 11, 11, 23, 27, 31, 44, 56, 64, 87]
[87, 64, 56, 44, 31, 27, 23, 11, 11, 11, 11, 10, 9, 1]
0
4

4. Functions - len(), min(), max(), sum(), sorted()
10 1 10 55
[1, 9, 10, 11, 11, 11, 11, 23, 27, 31, 44, 56, 64, 87]

5.1 "in" operator
True False

5.2 COPY METHODS
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]

5.3 Actual copy methods
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13]

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14]

2. Tuples

Ordered, Immutable, allows duplicates & multi data type

    b1=("max",1,"janav",2,"makkar",3,True)
    b2="max",1,"janav",2,"makkar",3,True # still a tuple without ()
    print(type(b1),type(b2),"\n")

    print(" 0. COMMA IS IMPORTANT ")
    b3=("janav") # not a tuple , just a string
    print(type(b3))
    b4=("janav",) # tuple, comma is important
    print(type(b4),"\n" )

    print(" 1. TUPLE CONSTRUCTOR")
    b5=tuple(["janav",1,"makkar",2,True]) # tuple() is a constructor
    print(b5,"\n")

    print(" 2. TUPLE UNPACKING " )
    b6=("janav",1,"makkar",2,True)
    name,rollno,surname,age,married=b6
    print(name)
    print(rollno)
    print(surname,"\n")

    b9=(0,1,2,3,4,5,6,7,8,9,10)
    a,*b,c=b9
    print(a) # 0
    print(b) # [1,2,3,4,5,6,7,8,9]
    print(c,"\n") # 10

    print(" 3. ACCESSING & SLICING")
    print(b6[0])
    print(b6[1])
    print(b6[-1],"\n")
    # Slicing
    print(b6[0:3])
    print(b6[3:])
    print(b6[:3])
    print(b6[1:-2])
    print(b6[:])
    print(b6[::2]) # step slicing
    print(b6[::-1])
    print(b6[-1:1:-1],"\n")

    print(" 4. MEMEBERSHIP OPERATOR ")
    for i in b6:
        print(i)

    print(1 in b6,"\n")

    print(" 5. BUILT-IN FUNCTIONS/METHODS ") # .count(), .index()
    b7=(tuple("apple")) # b7=("a","p","p","l","e")
    count=b7.count('p') # .count() - returns number of times value in the tuple
    index=b7.index('p') # .index() - returns index of first occurence of the given value
    print(b7)
    print(count)
    print(index,"\n")

    print(" 6. CONVERTING TUPLE TO LIST ")
    b8=list(b6)
    print(b8)
    print(type(b8),type(b6),"\n")

    print("7. TUPLE MORE EFFICIENT THAN LIST")
    import sys
    a28=["janav",1,"makkar",2,True]
    a29=("janav",1,"makkar",2,True)
    print(sys.getsizeof(a28),"bytes","List") # getsizeof(*) - returns size of the object in bytes
    print(sys.getsizeof(a29),"bytes", "Tuple", "\n")

    import timeit
    print(timeit.timeit(stmt="[1,2,3,4,5,6,7,8,9]",number=1000000),"List")
    # timeit.timeit(stmt="*",number=*) - returns time taken to execute the statement
    print(timeit.timeit(stmt="(1,2,3,4,5,6,7,8,9)",number=1000000),"Tuple","\n")

 0   <class 'tuple'> <class 'tuple'>

 0. COMMA IS IMPORTANT
<class 'str'>
<class 'tuple'>

 1. TUPLE CONSTRUCTOR
('janav', 1, 'makkar', 2, True)

 2. TUPLE UNPACKING
janav
1
makkar

0
[1, 2, 3, 4, 5, 6, 7, 8, 9]
10

 3. ACCESSING & SLICING
janav
1
True

('janav', 1, 'makkar')
(2, True)
('janav', 1, 'makkar')
(1, 'makkar')
('janav', 1, 'makkar', 2, True)
('janav', 'makkar', True)
(True, 2, 'makkar', 1, 'janav')
(True, 2, 'makkar')

 4. MEMEBERSHIP OPERATOR
janav
1
makkar
2
True
True

 5. BUILT-IN FUNCTIONS/METHODS
('a', 'p', 'p', 'l', 'e')
2
1

 6. CONVERTING TUPLE TO LIST
['janav', 1, 'makkar', 2, True]
<class 'list'> <class 'tuple'>

7. TUPLE MORE EFFICIENT THAN LIST
96 bytes List
80 bytes Tuple

0.21319740000001275 List
0.013402999999982512 Tuple

3. Dictionary

Key-Value pairs, Unordered, Mutable

c1={"name":"janav","rollno":42,"surname":"makkar","age":21,"married":False}
print(c1,"\n")

print("1. DICITIONARY CONSTRUCTOR")
c2=dict(name="janav",surname="makkar",age=21,married=False)
print(c2,"\n")                      # {"name":"janav","surname":"makkar","age":21,"married":False}

print("2. ACCESSING VALUES")
print(c1["name"],"\n")

print("3. ADDING KEY-VALUE PAIRS")
c1["email"]="jm.rocks@mail.com"
print(c1,"\n")

print("4. UPDATING KEY-VALUE PAIRS")
c1["email"]="jm.cool@mail.com"
print(c1,"\n")

print("5. DELETING KEY-VALUE PAIRS") # del, .pop(), .popitem()
del c2["married"]
print(c2,"\n")

c2.pop("age")
print(c2,"\n")

c2.popitem() # removes last key-value pair
print(c2,"\n")

print("6. MEMBERSHIP OPERATOR")

if "name" in c1:
    print(c1["name"])

try:
    print(c1["name"],"\n")
except:
    print("Error","\n")

print("7. LOOPING THROUGH DICTIONARY")
for i in c1: # prints only keys
    print(i)

for i in c1.keys(): # prints only keys
    print(i)

for i in c1.values(): # prints only values
    print(i)

for k,v in c1.items(): # prints key-value pairs
    print(k," - ",v)

print("8. COPYING DICTIONARY") # .copy(), dict(),
c3=c1
c3["surname"]="lakkar"
print("c1- ",c1,"c3- ",c3,"\n") # this happens because c3 is just a reference to c1, actual copy does'nt takes place

c4=c2.copy() # Now this is a copy
c4["surname"]="takkar"
print("c2- ",c2,"c4- ",c4,"\n")

c5=dict(c2) # Now this is a copy
c5["surname"]="jhakkar"
print("c2- ",c2,"c5- ",c5,"\n")


print("9. UPDATING DICTIONARY USING ANOTHER DICTIONARY")

c6={"name":"Max","age":28,"email":"max@wyz.com"}
c7=dict(name="Janav",age=22,email="jm.cool@email.com")
c6.update(c7)
print("c6- ",c6,"\n")


print("10. NESTED DICTIONARIES")

c8={"name":"janav","rollno":42,"surname":"makkar","age":21,"married":False,"address":{"street":"abc","city":"xyz","state":"pqr"}}
print(c8,"\n")


print("11. CONVERTING DICTIONARY TO LIST")

c9=list(c8)
print(c9,"\n")


print("12. CONVERTING DICTIONARY TO TUPLE")

c10=tuple(c8)
print(c10,"\n")


print("13. CONVERTING DICTIONARY TO STRING")

c11=str(c8)
print(c11,"\n")


print("14. DIFFERENT KEY TYPES")

c12=(1,3) # tuple
c13={c12:"Jello"} # tuple as key and string as value
print(c13,"\n") # Only immutable objects can be used as keys, so a list cannot be used as key

{'name': 'janav', 'rollno': 42, 'surname': 'makkar', 'age': 21, 'married': False}

1. DICITIONARY CONSTRUCTOR
{'name': 'janav', 'surname': 'makkar', 'age': 21, 'married': False}

2. ACCESSING VALUES
janav

3. ADDING KEY-VALUE PAIRS
{'name': 'janav', 'rollno': 42, 'surname': 'makkar', 'age': 21, 'married': False, 'email': 'jm.rocks@mail.com'}

4. UPDATING KEY-VALUE PAIRS
{'name': 'janav', 'rollno': 42, 'surname': 'makkar', 'age': 21, 'married': False, 'email': 'jm.cool@mail.com'}

5. DELETING KEY-VALUE PAIRS
{'name': 'janav', 'surname': 'makkar', 'age': 21}

{'name': 'janav', 'surname': 'makkar'}

{'name': 'janav'}

6. MEMBERSHIP OPERATOR
janav
janav

7. LOOPING THROUGH DICTIONARY
name
rollno
surname
age
married
email
name
rollno
surname
age
married
email
janav
42
makkar
21
False
jm.cool@mail.com
name  -  janav
rollno  -  42
surname  -  makkar
age  -  21
married  -  False
email  -  jm.cool@mail.com
8. COPYING DICTIONARY
c1-  {'name': 'janav', 'rollno': 42, 'surname': 'lakkar', 'age': 21, 'married': False, 'email': 'jm.cool@mail.com'} c3-  {'name': 'janav', 'rollno': 42, 'surname': 'lakkar', 'age': 21, 'married': False, 'email': 'jm.cool@mail.com'}

c2-  {'name': 'janav'} c4-  {'name': 'janav', 'surname': 'takkar'}

c2-  {'name': 'janav'} c5-  {'name': 'janav', 'surname': 'jhakkar'}

9. UPDATING DICTIONARY USING ANOTHER DICTIONARY
c6-  {'name': 'Janav', 'age': 22, 'email': 'jm.cool@email.com'}

10. NESTED DICTIONARIES
{'name': 'janav', 'rollno': 42, 'surname': 'makkar', 'age': 21, 'married': False, 'address': {'street': 'abc', 'city': 'xyz', 'state': 'pqr'}}

11. CONVERTING DICTIONARY TO LIST
['name', 'rollno', 'surname', 'age', 'married', 'address']

12. CONVERTING DICTIONARY TO TUPLE
('name', 'rollno', 'surname', 'age', 'married', 'address')

13. CONVERTING DICTIONARY TO STRING
{'name': 'janav', 'rollno': 42, 'surname': 'makkar', 'age': 21, 'married': False, 'address': {'street': 'abc', 'city': 'xyz', 'state': 'pqr'}}

14. DIFFERENT KEY TYPES
{(1, 3): 'Jello'}

4. Sets

Unordered, Mutable, No Duplicates, Multi Data types supported

d1={1,3,9,4,33,3,3,1,2}
print(d1,"\n") # output: {1, 2, 3, 4, 33, 9}

d2=set([1,3,9,4,33,3,3,1,2])
print(d2,"\n")

d3=set("janav makkar")
print(d3,"\n") # output: {'a', 'k', 'n', 'j', 'v', 'r', 'm', ' ', 'a'}

print("1. CREATE EMPTY SET")
d4=set() # empty set
d5={} # empty dictionary
print(type(d4),type(d5),"\n")  # output: <class 'set'> <class 'dict'>

print("2. ADD & DELETE ELEMENTS") # add(), remove(), discard(), pop(), clear()
d4.add(1) # add() method
d4.add(2)
d4.add(3)
d4.add(4)
d4.add(5)
print(d4,"\n")

d4.remove(2)    # remove() - removes element if present
print(d4,"\n")

d4.discard(3)   # discard() - removes element if present
print(d4,"\n")

d4.pop()        # pop() - removes random element
print(d4,"\n")

d4.clear()      # clear() - clears whole set
print(d4,"\n")

print("3. ITERATING THROUGH SET")
for i  in d2:
    print(i)

print("4. MEMBERSHIP OPERATOR")
if 33 in d2:
    print("Yes","\n")

print("5. SET OPERATIONS") # union(), intersection(), difference(), symetric_difference()
odds={1,3,5,7,9}
evens={0,2,4,6,8}
primes={2,3,5,7}
union=odds.union(evens) # union: aUb, output:
intersection=odds.intersection(primes) # intersection: a^b

print("Union - ",union,"\n","Intersection - ",intersection,"\n")
print(odds|evens,"\n") # union: aUb

c6={1,2,3,4,5,6,7,8,9,10}
c7={1,2,3,10,11,12}

diff=c6.difference(c7) # difference: a-b
print("Difference - ",diff,"\n")

symetric_diff=c6.symmetric_difference(c7) # symetric difference: aUb-a^b
print("Symetric Difference - ",symetric_diff,"\n")

print("6. UPDATE SET") # update(), intersection_update(), difference_update(), symetric_difference_update()
c6.update(c7) # update() method, adds all elements of c7 to c6
print("Update - ",c6,"\n") # output: {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11}

c6.intersection_update(c7) # intersection_update() method, removes all elements from c6 that are not present in c7
print("Intersection - ",c6,"\n") # output: {1, 2, 3, 10}

c6.difference_update(c7) # difference_update() method, removes all elements from c6 that are present in c7
print("Difference - ",c6,"\n")

primes.symmetric_difference_update(odds) # symetric_difference_update() method, removes all elements from c6 that are present in c7 and adds all elements from c7 that are not present in c6
print("Symmetric Difference - ",primes,"\n")

print("7. SUBSET & SUPERSET") # issubset(), issuperset()
c8={1,2,3,4,5,6,7,8,9,10}
c9={1,2,3,10}
print(c9.issubset(c8)) # issubset() method - true
print(c8.issubset(c9)) # issubset() method - false

print(c9.issuperset(c8)) # issuperset() method - false
print(c8.issuperset(c9)) # issuperset() method - true

print("8. DISJOINT")
print(c9.isdisjoint(c8)) # isdisjoint() method - false, true if no common elements

print("9. COPY SET")
c10=c9.copy() # copy() method, creates a copy of the set
print(c10,"\n")

c11=set(c9) # set() constructor
print(c11,"\n")

print("10. FROZEN SET")
# immutable set, but can contain mutable objects and
# union,intersection,difference,symetric_difference can be performed on it
c12=frozenset([1,2,3,4,5,6,7,8,9,10]) # frozen set

print("11. SET COMPREHENSIONS")
c13={i for i in range(1,11)}
print(c13,"\n")

c14={i**2 for i in range(1,11)}
print(c14,"\n")

c15={i for i in range(1,11) if i%2==0}
print(c15,"\n")

{1, 33, 3, 4, 2, 9}

{1, 33, 3, 4, 2, 9}

{'r', 'n', 'm', 'a', ' ', 'v', 'k', 'j'}

1. CREATE EMPTY SET
<class 'set'> <class 'dict'>

2. ADD & DELETE ELEMENTS
{1, 2, 3, 4, 5}

{1, 3, 4, 5}

{1, 4, 5}

{4, 5}

set()

3. ITERATING THROUGH SET
1
33
3
4
2
9
4. MEMBERSHIP OPERATOR
Yes

5. SET OPERATIONS
Union -  {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
 Intersection -  {3, 5, 7}

{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

Difference -  {4, 5, 6, 7, 8, 9}

Symetric Difference -  {4, 5, 6, 7, 8, 9, 11, 12}

6. UPDATE SET
Update -  {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}

Intersection -  {1, 2, 3, 10, 11, 12}

Difference -  set()

Symmetric Difference -  {1, 2, 9}

7. SUBSET & SUPERSET
True
False
False
True
8. DISJOINT
False
9. COPY SET
{10, 1, 2, 3}

{10, 1, 2, 3}

10. FROZEN SET
11. SET COMPREHENSIONS
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

{64, 1, 4, 36, 100, 9, 16, 49, 81, 25}

{2, 4, 6, 8, 10}

5. Strings

Ordered, Immutable, Text Representation

print("1. Quotes")
e1="Hello World" # Double quotes
e2='Janav Makkar' # Single quotes
e3="""Hello
    World""" # Triple quotes, used for multiline strings
e6='''Janav\
 Makkar''' # Triple quotes,\ -> escape character, used to ignore the next character, here it ignores the newline character
# \ -> outputs character in same line: Janav Makkar
# \n -> newline character
print(e1,"\n",e2,"\n",e3,"\n",e6)

e4="I'm Janav Makkar" # Single quotes inside double quotes
e5='I\'m Janav Makkar' # Escape character to use single quotes inside single quotes
print(e4,"\n",e5)

print("2. ACCESSING CHARACTERS")
print(e1[0]) # Accessing characters like a list
print(e1[-1],"\n")

# Strings are immutable, so this will give an error
# e1[0]="j"

print("3. SLICING")
print(e1[0:5]) # Slicing
print(e1[6:])
print(e1[:5])
print(e1[1:-1])

print(e1[0:10:2]) # Step Slicing
print(e1[::-1],"\n") # Reverse String

print("4. CONCATINATION")
e7="Hello"
e8="World"
e9=e7+" "+e8 # Concatination
print(e9,"\n")

print("6. ITERATING THROUGH STRING (CHARACTER BY CHARACTER)")
for i in e7:
    print(i)

print("7. CHECK SUBSTRING")
if "el" in e7:
    print("Yes","\n")
else:
    print("No","\n")

print("8. REMOVE WHITESPACES")
e10="       janu          "
print("With spaces - ",e10)

e11=e10.strip()             # strip() method, it does not change the OG string
print("Without spaces - ",e11,"\n")

print("9. CONVERTING TO LOWERCASE & UPPERCASE")
e12="Janav Makkar"
print(e12.lower()) # lower() method, it does not change the OG string due to immutability
print(e12.upper(),"\n") # upper() method, it does not change the OG string (dncos), returns new string (rns)

print("10. STARTS WITH & ENDS WITH")
print(e12.startswith("J")) # startswith() method, (dncos) (rns) (case sensitive)
print(e12.endswith("r"),"\n") # endswith() method, (dncos) (rns) (case sensitive)

print("11. FIND & REPLACE")
print(e12.find("Makkar")) # find() method, (dncos) (rns), returns index of first occurence of the substring
print(e12.find("makkar")) # find() method, (dncos) (rns), returns -1 if substring not found

print(e12.replace("Makkar","Lakkar")) # replace() method, (dncos) (rns), replaces all occurences of the substring
print(e12,"\n")

print("12. COUNT")
print(e12.count("a")) # count() method, (dncos), returns number of times substring occurs in the string
print(e12.count("a",0,5),"\n") # count() method, (dncos), returns number of times substring occurs in the string in the given range

print("13. CONVERTING STRING TO LIST") # split()
e13="How are you doing?"
e14=e13.split() # split() method, (dncos), returns a list of words in the string, space is the default delimiter
print(e14,"\n") # output: ['How', 'are', 'you', 'doing?']

e15="How,are,you,doing?"
e16=e15.split(",") # split() method, (dncos), returns a list of words in the string, comma is the delimiter chosen
print(e16,"\n")

print("14. CONVERTING LIST TO STRING ***") # join()
e17="".join(e14) # join() method, (dncos), returns a string of words in the list, no-space is the delimiter chosen
print(e17,"\n") # output: Howareyoudoing?

e18=" ".join(e14) # join() method, (dncos), returns a string of words in the list, space is the delimiter chosen
print(e18,"\n") # output: How are you doing?

print("15. COMPARING LIST TO STRING OPERATIONS")
from timeit import default_timer as timer
e19=['a']*10000

# bad
start=timer()
e20=""
for i in e19:
    e20+=i
stop=timer()
print("loop method - ",stop-start,"\n")

# good
start=timer()
e21="".join(e19)
stop=timer()
print("join method - ",stop-start,"\n")

print("16. FORMATTING STRINGS")
# % operator - old way
e22_str = "tom"
e22_int=22
e22_float=3.14159265359

e23_str="My var is %s" %e22_str
e23_int="My var is %d" %e22_int
e23_float="My var is %.3f" %e22_float
print(e23_str, e23_int, e23_float,"\n") # output: My var is tom | My var is 22 | My var is 3.142

# format() method - new way
e24_str="My var is {}".format(e22_str)
e24_int="My var is {}".format(e22_int)
e24_float="My var is {:.2f} & {}".format(e22_float,e22_str)
print(e24_str, e24_int, e24_float,"\n") # output: My var is tom | My var is 22 | My var is 3.14 & tom

# f-strings - newest way
e24_str= f"My var is {e22_str}"
e24_int= f"My var is {e22_int}"
e24_float= f"My var is {e22_float} & {e22_int*3}" # expressions can be used inside {}
print(e24_str, e24_int, e24_float,"\n") # output: My var is tom | My var is 22 | My var is 3.14159265359 & 66

1. Quotes
Hello World
 Janav Makkar
 Hello
    World
 Janav Makkar
I'm Janav Makkar
 I'm Janav Makkar
2. ACCESSING CHARACTERS
H
d

3. SLICING
Hello
World
Hello
ello Worl
HloWr
dlroW olleH

4. CONCATINATION
Hello World

6. ITERATING THROUGH STRING (CHARACTER BY CHARACTER)
H
e
l
l
o
7. CHECK SUBSTRING
Yes

8. REMOVE WHITESPACES
With spaces -         janu
Without spaces -  janu

9. CONVERTING TO LOWERCASE & UPPERCASE
janav makkar
JANAV MAKKAR

10. STARTS WITH & ENDS WITH
True
True

11. FIND & REPLACE
6
-1
Janav Lakkar
Janav Makkar

12. COUNT
4
2

13. CONVERTING STRING TO LIST
['How', 'are', 'you', 'doing?']

['How', 'are', 'you', 'doing?']

14. CONVERTING LIST TO STRING ***
Howareyoudoing?

How are you doing?

15. COMPARING LIST TO STRING OPERATIONS
loop method -  0.007538199999999051

join method -  0.0002733999999975367

16. FORMATTING STRINGS
My var is tom My var is 22 My var is 3.142

My var is tom My var is 22 My var is 3.14 & tom

My var is tom My var is 22 My var is 3.14159265359 & 66

6. Collections

6.1 Counter

Dict subclass for counting hashable objects
Counter(‘abracadabra’) - Counter({‘a’: 5, ‘b’: 2, ‘r’: 2, ‘c’: 1, ’d’: 1})

6.2 NamedTuple

Tuple with names for each position
namedtuple(‘Name’, ‘age’)

6.3 OrderedDict

Dict subclass that remembers the order entries were added
OrderedDict([(‘a’, 1), (‘b’, 2), (‘c’, 3)])

6.4 DefaultDict

Dict subclass that calls a factory function to supply missing \values instead of raising KeyError
d = defaultdict(list)

6.5 Deque

List-like container with fast appends and pops on either end
d = deque(‘ghi’) | d.append(‘j’) | d.appendleft(‘f’) | d.pop() | d.popleft()

print("6.1 COUNTER")
# Counter is a dictionary subclass which helps count hashable objects, like strings, lists, etc.
# It is an unordered collection where elements are stored as dictionary keys and their counts are stored as dictionary values.
# Counts are allowed to be any integer value including zero or negative counts.
# The Counter class is similar to bags or multisets in other languages.
# Counter objects have a dictionary interface except that they return a zero count for missing items instead of raising a KeyError.

from collections import Counter
f1="aaaaaaaaaabbbbbbcccccaabbcddxw"
f2=Counter(f1)
print(f2)       # returns a dictionary with key as the element and value as the count of the element
print(f2.items()) # returns a list of tuples, with each tuple containing the element and its count
print(f2.keys()) # returns a list of keys
print(f2.values()) # returns a list of values
print(f2.most_common(2)) # returns a list of tuples, with the most common n items
print(f2.most_common()[0][0])
print(f2.most_common()[0][1],"\n")

print(list(f2.elements())) # elements - returns an iterator object, with each element repeated as many times as its count

6.1 COUNTER
Counter({'a': 12, 'b': 8, 'c': 6, 'd': 2, 'x': 1, 'w': 1})
dict_items([('a', 12), ('b', 8), ('c', 6), ('d', 2), ('x', 1), ('w', 1)])
dict_keys(['a', 'b', 'c', 'd', 'x', 'w'])
dict_values([12, 8, 6, 2, 1, 1])
[('a', 12), ('b', 8)]
a
12

['a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'b', 'b', 'b', 'b', 'b', 'b', 'b', 'b', 'c', 'c', 'c', 'c', 'c', 'c', 'd', 'd', 'x', 'w']

print("6.2 NAMEDTUPLE")
# Namedtuple is a subclass of tuple, which has names for each position in the tuple and a named class
# Creates a class with a fixed set of attributes, which can be accessed by attribute names instead of index numbers
# Creates a class which is more memory efficient than a dictionary
# Creates a struct like data structure

from collections import namedtuple
Point = namedtuple('Point',"x,y") # namedtuple('ClassName','attributes')
p1=Point(1,2)
print(p1)
print(p1.x,p1.y)

6.2 NAMEDTUPLE
Point(x=1, y=2)
1 2

print("6.3 ORDEREDDICT")
# OrderedDict is a dictionary subclass which remembers the order in which the key-value pairs were added
# But it is slower than a normal dictionary, because it has to remember the order
# OrderedDict is used when the order of the key-value pairs is important
# OrderedDict is used when we want to create a FIFO queue, LIFO stack, cache.
# But now in python 3.7, normal dictionaries also remember the order in which the key-value pairs were added

from collections import OrderedDict

f3=OrderedDict()
f3['a']=1
f3['b']=2
f3['e']=5 # order is important
f3['c']=3
f3['d']=4

print(f3,"\n")

# normal dictionary
f4={}
f4['a']=1
f4['b']=2
f4['e']=5 # order is important
f4['c']=3
f4['d']=4
print(f4,"\n")

6.3 ORDEREDDICT
OrderedDict([('a', 1), ('b', 2), ('e', 5), ('c', 3), ('d', 4)])

{'a': 1, 'b': 2, 'e': 5, 'c': 3, 'd': 4}

print("6.4 DEFAULTDICT")
# Defaultdict is a dictionary subclass which calls a factory function to supply missing values, instead of raising a KeyError
# Defaultdict is used when we want to create a dictionary of lists, dictionaries , sets, tuples, int, float etc.

from collections import defaultdict

f5=defaultdict(int) # int is the factory function, which will be called to supply missing values
f5['a']=1
f5['b']=2
print(f5['a'])
print(f5['x']) # returns 0, because the factory function int is called to supply the missing value

f6=defaultdict(float) # float is the factory function, which will be called to supply missing values
f6['a']=1.1
print(f6['x']) # returns 0.0, because the factory function float is called to supply the missing value

f7=defaultdict(list) # list is the factory function
print(f7['a']) # returns [], because the factory function list is called to supply the missing value

f8={}
f8['a']=1
print(f8['x']) # returns KeyError, because the factory function is not called to supply the missing value

6.4 DEFAULTDICT
1
0
0.0
[]



---------------------------------------------------------------------------

KeyError                                  Traceback (most recent call last)

c:\Users\ASUS\Desktop\Intermediate python.ipynb Cell 22 in <cell line: 22>()
     <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#X30sZmlsZQ%3D%3D?line=19'>20</a> f8={}
     <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#X30sZmlsZQ%3D%3D?line=20'>21</a> f8['a']=1
---> <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#X30sZmlsZQ%3D%3D?line=21'>22</a> print(f8['x'])


KeyError: 'x'

print("6.5 DEQUE")
# Deque is a list-like container with fast appends and pops on either end, Double Ended Queue
# Deque is used when we want to create a queue or a stack
# Deque is faster than a list, because it is implemented as a doubly linked list
# Deque is thread safe, unlike a list
# Deque is used when we want to create a queue or a stack

from collections import deque

f9=deque() # append, appendleft, extend, extendleft, rotate, pop, popleft, clear
f9.append(1) # append() method, adds the value at the back
f9.append(2)
f9.appendleft(3) # appendleft() method, adds the value at the front
f9.appendleft(4)

f9.extend([5,6,7]) # extend() method, adds the list at the back
f9.extendleft([8,9,10]) # extendleft() method, adds the list at the front
print(f9,"\n")

f9.rotate(1) # rotate() method, rotates the deque by the given value, positive value rotates to the right, negative value rotates to the left
print(f9)
f9.rotate(-1)
print(f9)
f9.rotate(2)
print(f9,"\n")

f9.pop() # pop() method, removes the value at the back
print(f9)

f9.popleft() # popleft() method, removes the value at the front
print(f9)
f9.clear() # clear() method, clears the deque
print(f9)

6.5 DEQUE
deque([10, 9, 8, 4, 3, 1, 2, 5, 6, 7])

deque([7, 10, 9, 8, 4, 3, 1, 2, 5, 6])
deque([10, 9, 8, 4, 3, 1, 2, 5, 6, 7])
deque([6, 7, 10, 9, 8, 4, 3, 1, 2, 5])

deque([6, 7, 10, 9, 8, 4, 3, 1, 2])
deque([7, 10, 9, 8, 4, 3, 1, 2])
deque([])

7. Iter-Tools

product, permutations, combinations, accumulate, groupby, infinite iterators

print("7.1 Product")
# Product is a function which returns the cartesian product of the given iterables
# Product is used when we want to find all possible combinations of the given iterables

from itertools import product
g1=[1,2]
g2=[3,4]
g4=[9]
g3=product(g1,g2) # product() function, returns the cartesian product of the given iterables
print(g3)
print(list(g3),"\n") # output: [(1, 3), (1, 4), (2, 3), (2, 4)]

g5=product(g1,g2,g4)
print(list(g5),"\n") # output: [(1, 3, 9), (1, 4, 9), (2, 3, 9), (2, 4, 9)]

g6=product(g1,g4,repeat=2) # repeat keyword argument, repeats the given iterables
print(list(g6),"\n") # output: [(1, 9, 1, 9), (1, 9, 2, 9), (2, 9, 1, 9), (2, 9, 2, 9)]

# Program to brute force a 4 digit passcode
from string import digits, ascii_letters, punctuation
print(digits,"\n")
print(*product(digits, repeat=4),"\n")
print(list(product(ascii_letters+digits+punctuation, repeat=2)),"\n") #

7.1 Product
<itertools.product object at 0x000001F008353740>
[(1, 3), (1, 4), (2, 3), (2, 4)]

[(1, 3, 9), (1, 4, 9), (2, 3, 9), (2, 4, 9)]

[(1, 9, 1, 9), (1, 9, 2, 9), (2, 9, 1, 9), (2, 9, 2, 9)]

0123456789

('0', '0', '0', '0') ('0', '0', '0', '1') ('0', '0', '0', '2') ('0', '0', '0', '3') ('0', '0', '0', '4') ('0', '0', '0', '5') ('0', '0', '0', '6') ('0', '0', '0', '7') ('0', '0', '0', '8') ('0', '0', '0', '9') ('0', '0', '1', '0') ('0', '0', '1', '1') ('0', '0', '1', '2') ('0', '0', '1', '3') ('0', '0', '1', '4') ('0', '0', '1', '5') ('0', '0', '1', '6') ('0', '0', '1', '7') ('0', '0', '1', '8') ('0', '0', '1', '9') ('0', '0', '2', '0') ('0', '0', '2', '1') ('0', '0', '2', '2') ('0', '0', '2', '3') ('0', '0', '2', '4') ('0', '0', '2', '5') ('0', '0', '2', '6') ('0', '0', '2', '7') ('0', '0', '2', '8') ('0', '0', '2', '9') ('0', '0', '3', '0') ('0', '0', '3', '1') ('0', '0', '3', '2') ('0', '0', '3', '3') ('0', '0', '3', '4') ('0', '0', '3', '5') ('0', '0', '3', '6') ('0', '0', '3', '7') ('0', '0', '3', '8') ('0', '0', '3', '9') ('0', '0', '4', '0') ('0', '0', '4', '1') ('0', '0', '4', '2') ('0', '0', '4', '3') ('0', '0', '4', '4') ('0', '0', '4', '5') ('0', '0', '4', '6') ('0', '0', '4', '7') ('0', '0', '4', '8') ('0', '0', '4', '9') ('0', '0', '5', '0') ('0', '0', '5', '1') ('0', '0', '5', '2') ('0', '0', '5', '3') ('0', '0', '5', '4') ('0', '0', '5', '5') ('0', '0', '5', '6') ('0', '0', '5', '7') ('0', '0', '5', '8') ('0', '0', '5', '9') ('0', '0', '6', '0') ('0', '0', '6', '1') ('0', '0', '6', '2') ('0', '0', '6', '3') ('0', '0', '6', '4') ('0', '0', '6', '5') ('0', '0', '6', '6') ('0', '0', '6', '7') ('0', '0', '6', '8') ('0', '0', '6', '9') ('0', '0', '7', '0') ('0', '0', '7', '1') ('0', '0', '7', '2') ('0', '0', '7', '3') ('0', '0', '7', '4') ('0', '0', '7', '5') ('0', '0', '7', '6') ('0', '0', '7', '7') ('0', '0', '7', '8') ('0', '0', '7', '9') ('0', '0', '8', '0') ('0', '0', '8', '1') ('0', '0', '8', '2') ('0', '0', '8', '3') ('0', '0', '8', '4') ('0', '0', '8', '5') ('0', '0', '8', '6') ('0', '0', '8', '7') ('0', '0', '8', '8') ('0', '0', '8', '9') ('0', '0', '9', '0') ('0', '0', '9', '1') ('0', '0', '9', '2') ('0', '0', '9', '3') ('0', '0', '9', '4') ('0', '0', '9', '5') ('0', '0', '9', '6') ('0', '0', '9', '7') ('0', '0', '9', '8') ('0', '0', '9', '9') ('0', '1', '0', '0') ('0', '1', '0', '1') ('0', '1', '0', '2') ('0', '1', '0', '3') ('0', '1', '0', '4') ('0', '1', '0', '5') ('0', '1', '0', '6') ('0', '1', '0', '7') ('0', '1', '0', '8') ('0', '1', '0', '9') ('0', '1', '1', '0') ('0', '1', '1', '1') ('0', '1', '1', '2') ('0', '1', '1', '3') ('0', '1', '1', '4') ('0', '1', '1', '5') ('0', '1', '1', '6') ('0', '1', '1', '7') ('0', '1', '1', '8') ('0', '1', '1', '9') ('0', '1', '2', '0') ('0', '1', '2', '1') ('0', '1', '2', '2') ('0', '1', '2', '3') ('0', '1', '2', '4') ('0', '1', '2', '5') ('0', '1', '2', '6') ('0', '1', '2', '7') ('0', '1', '2', '8') ('0', '1', '2', '9') ('0', '1', '3', '0') ('0', '1', '3', '1') ('0', '1', '3', '2') ('0', '1', '3', '3') ('0', '1', '3', '4') ('0', '1', '3', '5') ('0', '1', '3', '6') ('0', '1', '3', '7') ('0', '1', '3', '8') ('0', '1', '3', '9') ('0', '1', '4', '0') ('0', '1', '4', '1') ('0', '1', '4', '2') ('0', '1', '4', '3') ('0', '1', '4', '4') ('0', '1', '4', '5') ('0', '1', '4', '6') ('0', '1', '4', '7') ('0', '1', '4', '8') ('0', '1', '4', '9') ('0', '1', '5', '0') ('0', '1', '5', '1') ('0', '1', '5', '2') ('0', '1', '5', '3') ('0', '1', '5', '4') ('0', '1', '5', '5') ('0', '1', '5', '6') ('0', '1', '5', '7') ('0', '1', '5', '8') ('0', '1', '5', '9') ('0', '1', '6', '0') ('0', '1', '6', '1') ('0', '1', '6', '2') ('0', '1', '6', '3') ('0', '1', '6', '4') ('0', '1', '6', '5') ('0', '1', '6', '6') ('0', '1', '6', '7') ('0', '1', '6', '8') ('0', '1', '6', '9') ('0', '1', '7', '0') ('0', '1', '7', '1') ('0', '1', '7', '2') ('0', '1', '7', '3') ('0', '1', '7', '4') ('0', '1', '7', '5') ('0', '1', '7', '6') ('0', '1', '7', '7') ('0', '1', '7', '8') ('0', '1', '7', '9') ('0', '1', '8', '0') ('0', '1', '8', '1') ('0', '1', '8', '2') ('0', '1', '8', '3') ('0', '1', '8', '4') ('0', '1', '8', '5') ('0', '1', '8', '6') ('0', '1', '8', '7') ('0', '1', '8', '8') ('0', '1', '8', '9') 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'4'), ('\\', '5'), ('\\', '6'), ('\\', '7'), ('\\', '8'), ('\\', '9'), ('\\', '!'), ('\\', '"'), ('\\', '#'), ('\\', '$'), ('\\', '%'), ('\\', '&'), ('\\', "'"), ('\\', '('), ('\\', ')'), ('\\', '*'), ('\\', '+'), ('\\', ','), ('\\', '-'), ('\\', '.'), ('\\', '/'), ('\\', ':'), ('\\', ';'), ('\\', '<'), ('\\', '='), ('\\', '>'), ('\\', '?'), ('\\', '@'), ('\\', '['), ('\\', '\\'), ('\\', ']'), ('\\', '^'), ('\\', '_'), ('\\', '`'), ('\\', '{'), ('\\', '|'), ('\\', '}'), ('\\', '~'), (']', 'a'), (']', 'b'), (']', 'c'), (']', 'd'), (']', 'e'), (']', 'f'), (']', 'g'), (']', 'h'), (']', 'i'), (']', 'j'), (']', 'k'), (']', 'l'), (']', 'm'), (']', 'n'), (']', 'o'), (']', 'p'), (']', 'q'), (']', 'r'), (']', 's'), (']', 't'), (']', 'u'), (']', 'v'), (']', 'w'), (']', 'x'), (']', 'y'), (']', 'z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`'), (']', '{'), (']', '|'), (']', '}'), (']', '~'), ('^', 'a'), ('^', 'b'), ('^', 'c'), ('^', 'd'), ('^', 'e'), ('^', 'f'), ('^', 'g'), ('^', 'h'), ('^', 'i'), ('^', 'j'), ('^', 'k'), ('^', 'l'), ('^', 'm'), ('^', 'n'), ('^', 'o'), ('^', 'p'), ('^', 'q'), ('^', 'r'), ('^', 's'), ('^', 't'), ('^', 'u'), ('^', 'v'), ('^', 'w'), ('^', 'x'), ('^', 'y'), ('^', 'z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`'), ('^', '{'), ('^', '|'), ('^', '}'), ('^', '~'), ('_', 'a'), ('_', 'b'), ('_', 'c'), ('_', 'd'), ('_', 'e'), ('_', 'f'), ('_', 'g'), ('_', 'h'), ('_', 'i'), ('_', 'j'), ('_', 'k'), ('_', 'l'), ('_', 'm'), ('_', 'n'), ('_', 'o'), ('_', 'p'), ('_', 'q'), ('_', 'r'), ('_', 's'), ('_', 't'), ('_', 'u'), ('_', 'v'), ('_', 'w'), ('_', 'x'), ('_', 'y'), ('_', 'z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`'), ('_', '{'), ('_', '|'), ('_', '}'), ('_', '~'), ('`', 'a'), ('`', 'b'), ('`', 'c'), ('`', 'd'), ('`', 'e'), ('`', 'f'), ('`', 'g'), ('`', 'h'), ('`', 'i'), ('`', 'j'), ('`', 'k'), ('`', 'l'), ('`', 'm'), ('`', 'n'), ('`', 'o'), ('`', 'p'), ('`', 'q'), ('`', 'r'), ('`', 's'), ('`', 't'), ('`', 'u'), ('`', 'v'), ('`', 'w'), ('`', 'x'), ('`', 'y'), ('`', 'z'), ('`', 'A'), ('`', 'B'), ('`', 'C'), ('`', 'D'), ('`', 'E'), ('`', 'F'), ('`', 'G'), ('`', 'H'), ('`', 'I'), ('`', 'J'), ('`', 'K'), ('`', 'L'), ('`', 'M'), ('`', 'N'), ('`', 'O'), ('`', 'P'), ('`', 'Q'), ('`', 'R'), ('`', 'S'), ('`', 'T'), ('`', 'U'), ('`', 'V'), ('`', 'W'), ('`', 'X'), ('`', 'Y'), ('`', 'Z'), ('`', '0'), ('`', '1'), ('`', '2'), ('`', '3'), ('`', '4'), ('`', '5'), ('`', '6'), ('`', '7'), ('`', '8'), ('`', '9'), ('`', '!'), ('`', '"'), ('`', '#'), ('`', '$'), ('`', '%'), ('`', '&'), ('`', "'"), ('`', '('), ('`', ')'), ('`', '*'), ('`', '+'), ('`', ','), ('`', '-'), ('`', '.'), ('`', '/'), ('`', ':'), ('`', ';'), ('`', '<'), ('`', '='), ('`', '>'), ('`', '?'), ('`', '@'), ('`', '['), ('`', '\\'), ('`', ']'), ('`', '^'), ('`', '_'), ('`', '`'), ('`', '{'), ('`', '|'), ('`', '}'), ('`', '~'), ('{', 'a'), ('{', 'b'), ('{', 'c'), ('{', 'd'), ('{', 'e'), ('{', 'f'), ('{', 'g'), ('{', 'h'), ('{', 'i'), ('{', 'j'), ('{', 'k'), ('{', 'l'), ('{', 'm'), ('{', 'n'), ('{', 'o'), ('{', 'p'), ('{', 'q'), ('{', 'r'), ('{', 's'), ('{', 't'), ('{', 'u'), ('{', 'v'), ('{', 'w'), ('{', 'x'), ('{', 'y'), ('{', 'z'), ('{', 'A'), ('{', 'B'), ('{', 'C'), ('{', 'D'), ('{', 'E'), ('{', 'F'), ('{', 'G'), ('{', 'H'), ('{', 'I'), ('{', 'J'), ('{', 'K'), ('{', 'L'), ('{', 'M'), ('{', 'N'), ('{', 'O'), ('{', 'P'), ('{', 'Q'), ('{', 'R'), ('{', 'S'), ('{', 'T'), ('{', 'U'), ('{', 'V'), ('{', 'W'), ('{', 'X'), ('{', 'Y'), ('{', 'Z'), ('{', '0'), ('{', '1'), ('{', '2'), ('{', '3'), ('{', '4'), ('{', '5'), ('{', '6'), ('{', '7'), ('{', '8'), ('{', '9'), ('{', '!'), ('{', '"'), ('{', '#'), ('{', '$'), ('{', '%'), ('{', '&'), ('{', "'"), ('{', '('), ('{', ')'), ('{', '*'), ('{', '+'), ('{', ','), ('{', '-'), ('{', '.'), ('{', '/'), ('{', ':'), ('{', ';'), ('{', '<'), ('{', '='), ('{', '>'), ('{', '?'), ('{', '@'), ('{', '['), ('{', '\\'), ('{', ']'), ('{', '^'), ('{', '_'), ('{', '`'), ('{', '{'), ('{', '|'), ('{', '}'), ('{', '~'), ('|', 'a'), ('|', 'b'), ('|', 'c'), ('|', 'd'), ('|', 'e'), ('|', 'f'), ('|', 'g'), ('|', 'h'), ('|', 'i'), ('|', 'j'), ('|', 'k'), ('|', 'l'), ('|', 'm'), ('|', 'n'), ('|', 'o'), ('|', 'p'), ('|', 'q'), ('|', 'r'), ('|', 's'), ('|', 't'), ('|', 'u'), ('|', 'v'), ('|', 'w'), ('|', 'x'), ('|', 'y'), ('|', 'z'), ('|', 'A'), ('|', 'B'), ('|', 'C'), ('|', 'D'), ('|', 'E'), ('|', 'F'), ('|', 'G'), ('|', 'H'), ('|', 'I'), ('|', 'J'), ('|', 'K'), ('|', 'L'), ('|', 'M'), ('|', 'N'), ('|', 'O'), ('|', 'P'), ('|', 'Q'), ('|', 'R'), ('|', 'S'), ('|', 'T'), ('|', 'U'), ('|', 'V'), ('|', 'W'), ('|', 'X'), ('|', 'Y'), ('|', 'Z'), ('|', '0'), ('|', '1'), ('|', '2'), ('|', '3'), ('|', '4'), ('|', '5'), ('|', '6'), ('|', '7'), ('|', '8'), ('|', '9'), ('|', '!'), ('|', '"'), ('|', '#'), ('|', '$'), ('|', '%'), ('|', '&'), ('|', "'"), ('|', '('), ('|', ')'), ('|', '*'), ('|', '+'), ('|', ','), ('|', '-'), ('|', '.'), ('|', '/'), ('|', ':'), ('|', ';'), ('|', '<'), ('|', '='), ('|', '>'), ('|', '?'), ('|', '@'), ('|', '['), ('|', '\\'), ('|', ']'), ('|', '^'), ('|', '_'), ('|', '`'), ('|', '{'), ('|', '|'), ('|', '}'), ('|', '~'), ('}', 'a'), ('}', 'b'), ('}', 'c'), ('}', 'd'), ('}', 'e'), ('}', 'f'), ('}', 'g'), ('}', 'h'), ('}', 'i'), ('}', 'j'), ('}', 'k'), ('}', 'l'), ('}', 'm'), ('}', 'n'), ('}', 'o'), ('}', 'p'), ('}', 'q'), ('}', 'r'), ('}', 's'), ('}', 't'), ('}', 'u'), ('}', 'v'), ('}', 'w'), ('}', 'x'), ('}', 'y'), ('}', 'z'), ('}', 'A'), ('}', 'B'), ('}', 'C'), ('}', 'D'), ('}', 'E'), ('}', 'F'), ('}', 'G'), ('}', 'H'), ('}', 'I'), ('}', 'J'), ('}', 'K'), ('}', 'L'), ('}', 'M'), ('}', 'N'), ('}', 'O'), ('}', 'P'), ('}', 'Q'), ('}', 'R'), ('}', 'S'), ('}', 'T'), ('}', 'U'), ('}', 'V'), ('}', 'W'), ('}', 'X'), ('}', 'Y'), ('}', 'Z'), ('}', '0'), ('}', '1'), ('}', '2'), ('}', '3'), ('}', '4'), ('}', '5'), ('}', '6'), ('}', '7'), ('}', '8'), ('}', '9'), ('}', '!'), ('}', '"'), ('}', '#'), ('}', '$'), ('}', '%'), ('}', '&'), ('}', "'"), ('}', '('), ('}', ')'), ('}', '*'), ('}', '+'), ('}', ','), ('}', '-'), ('}', '.'), ('}', '/'), ('}', ':'), ('}', ';'), ('}', '<'), ('}', '='), ('}', '>'), ('}', '?'), ('}', '@'), ('}', '['), ('}', '\\'), ('}', ']'), ('}', '^'), ('}', '_'), ('}', '`'), ('}', '{'), ('}', '|'), ('}', '}'), ('}', '~'), ('~', 'a'), ('~', 'b'), ('~', 'c'), ('~', 'd'), ('~', 'e'), ('~', 'f'), ('~', 'g'), ('~', 'h'), ('~', 'i'), ('~', 'j'), ('~', 'k'), ('~', 'l'), ('~', 'm'), ('~', 'n'), ('~', 'o'), ('~', 'p'), ('~', 'q'), ('~', 'r'), ('~', 's'), ('~', 't'), ('~', 'u'), ('~', 'v'), ('~', 'w'), ('~', 'x'), ('~', 'y'), ('~', 'z'), ('~', 'A'), ('~', 'B'), ('~', 'C'), ('~', 'D'), ('~', 'E'), ('~', 'F'), ('~', 'G'), ('~', 'H'), ('~', 'I'), ('~', 'J'), ('~', 'K'), ('~', 'L'), ('~', 'M'), ('~', 'N'), ('~', 'O'), ('~', 'P'), ('~', 'Q'), ('~', 'R'), ('~', 'S'), ('~', 'T'), ('~', 'U'), ('~', 'V'), ('~', 'W'), ('~', 'X'), ('~', 'Y'), ('~', 'Z'), ('~', '0'), ('~', '1'), ('~', '2'), ('~', '3'), ('~', '4'), ('~', '5'), ('~', '6'), ('~', '7'), ('~', '8'), ('~', '9'), ('~', '!'), ('~', '"'), ('~', '#'), ('~', '$'), ('~', '%'), ('~', '&'), ('~', "'"), ('~', '('), ('~', ')'), ('~', '*'), ('~', '+'), ('~', ','), ('~', '-'), ('~', '.'), ('~', '/'), ('~', ':'), ('~', ';'), ('~', '<'), ('~', '='), ('~', '>'), ('~', '?'), ('~', '@'), ('~', '['), ('~', '\\'), ('~', ']'), ('~', '^'), ('~', '_'), ('~', '`'), ('~', '{'), ('~', '|'), ('~', '}'), ('~', '~')]

print("7.2 PERMUTATIONS")
# Permutations is a function which returns all possible permutations of the given iterable

from itertools import permutations
g7=[1,2,3]

g8=permutations(g7)
g9=permutations(g7,2) # r keyword argument, returns permutations of length r
g12=list(g9)

print(list(g8)) # output: [(1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)]
print(g12) # output: [(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
print(len(g12)) # nPr = n!/(n-r)! = 3!/(3-2)! = 6

7.2 PERMUTATIONS
[(1, 2, 3), (1, 3, 2), (2, 1, 3), (2, 3, 1), (3, 1, 2), (3, 2, 1)]
[(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
6

print("7.3 COMBINATIONS")
# Combinations is a function which returns all possible combinations of the given iterable

from itertools import combinations , combinations_with_replacement
g10=[1,2,3,4]

g11=list(combinations(g10,2)) # r keyword argument, returns combinations of length r
g13=list(combinations(g10,3))

print(g11)
print(len(g11)) # output: [(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)] nCr = n!/(r!*(n-r)!) = 4!/(2!*(4-2)!) = 6

print(g13)      # nCr = n!/(r!*(n-r)!) = 4!/(3!*(4-3)!) = 4
print(len(g13)) # output: [(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]

g14=list(combinations_with_replacement(g10,2)) # combinations_with_replacement() function, returns combinations with replacement
print(g14)      # output: [(1, 1), (1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (2, 4), (3, 3), (3, 4), (4, 4)]
print(len(g14)) # nHr = n+r-1Cr = 4+2-1C2 = 5C2 = 10

7.3 COMBINATIONS
[(1, 2), (1, 3), (1, 4), (2, 3), (2, 4), (3, 4)]
6
[(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]
4
[(1, 1), (1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (2, 4), (3, 3), (3, 4), (4, 4)]
10

print("7.4 ACCUMULATE")
# Accumulate is a function which returns the accumulated sum of the given iterable

import itertools
import operator

g15=[1,2,5,3,4]
g16=list(itertools.accumulate(g15))
print(g16) # output: [1, 3, 8, 11, 15]

g17=list(itertools.accumulate(g15,operator.mul)) # operator.mul is the function which is applied to the accumulated multiplied
print(g17) # output: [1, 2, 10, 30, 120]

g18=list(itertools.accumulate(g15,operator.sub)) # operator.sub is the function which is applied to the accumulated subtracted
print(g18) # output: [1, -1, -6, -9, -13]

g19=list(itertools.accumulate(g15,max)) # gives max
print(g19) # output: [1, 2, 5, 5, 5]

7.4 ACCUMULATE
[1, 3, 8, 11, 15]
[1, 2, 10, 30, 120]
[1, -1, -6, -9, -13]
[1, 2, 5, 5, 5]

print("7.5 GROUPBY")
# groupby is a function which returns an iterator object, with consecutive keys and groups
# groupby is used when we want to group the elements of the iterable based on a key function

from itertools import groupby
g20=[1,2,3,4,5,6,7,8,9,10]

def smaller_than5(x):
    return x<5

g21=groupby(g20,key=smaller_than5) # groupby() function, returns an iterator object

for key,value in g21:
    print("1 ",key,value)

#########################################
for k,v in groupby(g20,key=lambda x:x<5):   # this works
    print("2 ",k,list(v))

#########################################
for k,v in groupby(g20,key=lambda x:x%2==0):    # does not work
    print("3 ",k,list(v))

#########################################
g22=[{'name':'janav','age':21},{'name':'makkar','age':21},{'name':'janav','age':24},{'name':'makkar','age':24}] # list of dictionaries

for k, v in groupby(g22, lambda x:x['age']):    # this works
    print("4 ",k,list(v))

for k, v in groupby(g22, lambda x:x['name']):   # does not work
    print("5 ",k,list(v))

7.5 GROUPBY
1  True <itertools._grouper object at 0x000002B12EE5DB50>
1  False <itertools._grouper object at 0x000002B12EE45130>
2  True [1, 2, 3, 4]
2  False [5, 6, 7, 8, 9, 10]
3  False [1]
3  True [2]
3  False [3]
3  True [4]
3  False [5]
3  True [6]
3  False [7]
3  True [8]
3  False [9]
3  True [10]
4  21 [{'name': 'janav', 'age': 21}, {'name': 'makkar', 'age': 21}]
4  24 [{'name': 'janav', 'age': 24}, {'name': 'makkar', 'age': 24}]
5  janav [{'name': 'janav', 'age': 21}]
5  makkar [{'name': 'makkar', 'age': 21}]
5  janav [{'name': 'janav', 'age': 24}]
5  makkar [{'name': 'makkar', 'age': 24}]

print("7.6 INFINITE ITERATORS") # count, cycle, repeat

from itertools import count, cycle, repeat

for i in count(10): # count() function, returns an iterator object, which counts from the given value
    print(i)
    if i==15:
        print("\n")   # infinite loop, break to stop
        break

#########################################
for i in repeat(69,8): # repeat() function, returns an iterator object, which repeats the given value n times
    print(i)

print("\n")   # infinite loop, break to stop

#########################################
g23=[1,2,3,4,5]
for i in cycle(g23): # cycle() function, returns an iterator object, which cycles through the given iterable
    print(i)
    if i==5:    # infinite loop, break to stop
        break

7.6 INFINITE ITERATORS
10
11
12
13
14
15


69
69
69
69
69
69
69
69
1
2
3
4
5

8. Lambda Functions

map, filter, reduce

# lambda functions are anonymous functions, which are defined without a name, which is used only once
# a function which is passed as an argument to another function

# lambda arguments: expression
add10 = lambda x: x+10
print(add10(15))

expo = lambda x,y: x**y # lambda function with multiple arguments
print(expo(4,3))

25
64

print("8.1 Map \n")
# map(func, seq)
# map() function, returns an iterator object, which applies the given function to each element of the given iterable

h1=[1,2,3,4,5,6]
h2=map(lambda x: x*2, h1)
print(list(h2)) # output: [2, 4, 6, 8, 10, 12]

h3=[x*2 for x in h1] # list comprehension used to do the same thing
print(h3)

8.1 Map

[2, 4, 6, 8, 10, 12]
[2, 4, 6, 8, 10, 12]

print("8.2 Filter \n")
# filter(func, seq)
# filter() function, returns an iterator object, which filters the given iterable based on the given function
# returns only those elements for which the function returns true

h3=filter(lambda x: x%2==0,h1)
print(list(h3))

h4=[x for x in h1 if x%2==0] # list comprehension used to do the same thing
print(list(h4))

8.2 Filter

[2, 4, 6]
[2, 4, 6]

print("8.3 Reduce \n")
# reduce(func, seq)
# reduce() function, returns a single value, which is the result of applying the given function to the given iterable
# it is not a built-in function, it is in the functools module
# it is used to apply a function to all the elements of the given iterable, and reduce it to a single value

from functools import reduce

h5=reduce(lambda prevResult, currElement: prevResult*currElement, h1)
print(h5)

8.3 Reduce

720

9. Exceptions And Errors

# Types of Errors
# 1. Syntax Error - when the syntax is wrong
# 2. Runtime Error - when the code is syntactically correct, but the code fails to execute
# 3. Logical Error - when the code is syntactically correct, but the code does not do what it is supposed to do

# Types of runtime errors
# 1. ZeroDivisionError - when we divide by zero
# 2. NameError - when we use a variable which is not defined
# 3. TypeError - when we use an object of the wrong type
# 4. IndexError - when we use an index which is out of range
# 5. ValueError - when we use an object of the right type, but with an inappropriate value
# 6. KeyError - when we use a key which is not in the dictionary
# 7. ImportError - when we import a module which does not exist
# 8. AttributeError - when we use an attribute which does not exist
# 9. KeyboardInterrupt - when we press ctrl+c to interrupt the program
# 10. RuntimeError - when we use an object of the right type, but with an inappropriate value
# 11. NotImplementedError - when we use a function which is not implemented
# 12. StopIteration - when we use next() on an iterator which has no more values
# 13. IndentationError - when the indentation is wrong
# 14. TabError - when the indentation is wrong
# 15. SystemError - when the interpreter detects an internal error
# 16. MemoryError - when the program runs out of memory
# 17. FloatingPointError - when we use a floating point number which is not defined
# 18. OverflowError - when we use a number which is too large
# 19. IOError - when we use a file which does not exist
# 20. OSError - when we use a file which does not exist
# 21. EOFError - when we use input() and the user presses ctrl+d
# 22. Warning - when something unexpected happens, but the program can still continue
# 23. DeprecationWarning - when a deprecated feature is used
# 24. SyntaxWarning - when a syntax error is detected
# 25. RuntimeWarning - when a runtime error is detected
# 26. FileNotFoundError - when a file is not found
# 27. ModuleNotFoundError - when a module is not found
# 28. UnicodeError - when a unicode error occurs
# 29. ValueError - when a value error occurs

# Exception Handling

# Raise an exception
# raise Exception("Error Message")
i1=-5
if i1<0:                                        # raise an exception
    raise Exception("i1 cannot be negative")

<>:11: SyntaxWarning: assertion is always true, perhaps remove parentheses?
<>:11: SyntaxWarning: assertion is always true, perhaps remove parentheses?



---------------------------------------------------------------------------

Exception                                 Traceback (most recent call last)

c:\Users\ASUS\Desktop\Intermediate python.ipynb Cell 39 in <cell line: 6>()
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=4'>5</a> i1=-5
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=5'>6</a> if i1<0:                                        #
----> <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=6'>7</a>     raise Exception("i1 cannot be negative")
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=8'>9</a> # Assert statement
     <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=9'>10</a> # assert condition, "Error Message", if condition is false, then AssertionError is raised
     <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y222sZmlsZQ%3D%3D?line=10'>11</a> assert(i1>0, "i1 cannot be negative")


Exception: i1 cannot be negative

# Assert statement
# assert condition, "Error Message"
# if condition is false, then AssertionError is raised
assert i1>0, "i1 cannot be negative"            # assert statement

---------------------------------------------------------------------------

AssertionError                            Traceback (most recent call last)

c:\Users\ASUS\Desktop\Intermediate python.ipynb Cell 40 in <cell line: 4>()
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y223sZmlsZQ%3D%3D?line=0'>1</a> # Assert statement
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y223sZmlsZQ%3D%3D?line=1'>2</a> # assert condition, "Error Message"
      <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y223sZmlsZQ%3D%3D?line=2'>3</a> # if condition is false, then AssertionError is raised
----> <a href='vscode-notebook-cell:/c%3A/Users/ASUS/Desktop/Intermediate%20python.ipynb#Y223sZmlsZQ%3D%3D?line=3'>4</a> assert i1>0, "i1 cannot be negative"


AssertionError: i1 cannot be negative

# try-except-finally-else statement
# code in try block is executed, if an exception occurs, then the code in except block is executed
# if no exception occurs, then the code in else block is executed
# code in finally block is always executed, whether an exception occurs or not

print("\n 1. try-except")
try:
    i2=5/0
except:
    print("Error")

print("\n 2. try-except as e")
try:
    i2=5/0
except Exception as e: # Exception is the base class of all exceptions
    print(e)

print("\n 3. try except multiple exceptions")
try:
    i2=5/1
    i3=i2+"10"
except ZeroDivisionError as e: # ZeroDivisionError is a subclass of Exception
    print(e)
except TypeError as e: # TypeError is a subclass of Exception
    print(e)

print("\n 4. try except multiple exceptions-2")
try:
    i2=5/0
    i3=i2+"10"
except ZeroDivisionError as e: # ZeroDivisionError
    print(e)
except TypeError as e: # TypeError
    print(e)

print("\n 5. try-except-else")
try:
    i2=5/1
    i3=i2+10
except ZeroDivisionError as e: # ZeroDivisionError
    print(e)
except TypeError as e: # TypeError
    print(e)
else:
    print("No Error")

print("\n 6. try-except-finally with exception")
try:
    i2=5/1
    i3=i2+"10"
except ZeroDivisionError as e: # ZeroDivisionError
    print(e)
except TypeError as e: # TypeError
    print(e)
else:
    print("No Error")
finally:
    print("Finally, cleanup code")

print("\n 7. try-except-finally-2 with else running")
try:
    i2=5/1
    i3=i2+10
except ZeroDivisionError as e: # ZeroDivisionError
    print(e)
except TypeError as e: # TypeError
    print(e)
else:
    print("No Error")
finally:
    print("Finally, cleanup code")

 1. try-except
Error

 2. try-except as e
division by zero

 3. try except multiple exceptions
unsupported operand type(s) for +: 'float' and 'str'

 4. try except multiple exceptions-2
division by zero

 5. try-except-else
No Error

 6. try-except-finally with exception
unsupported operand type(s) for +: 'float' and 'str'
Finally, cleanup code

 7. try-except-finally-2 with else running
No Error
Finally, cleanup code

# Create a custom exception

class ValueToHighError(Exception):                      # custom exception
    pass

class ValueToSmall(Exception):                          # custom exception2
    def __init__(self, message, value):
        self.message=message
        self.value=value

def test_value(x):                                      # function to test the value
    if x>100:
        raise ValueToHighError("Value is too high")
    if x<5:
        raise ValueToSmall("Value is too small",x)


try:                                                    # try-except block
    test_value(200)
except ValueToHighError as e:
    print(e)
except ValueToSmall as e:
    print(e.message,e.value)


try:                                                    # try-except block2
    test_value(2)
except ValueToHighError as e:
    print(e)
except ValueToSmall as e:
    print(e.message,e.value)

Value is too high
Value is too small 2

10. Logging

11. Json

# PYTHON        ->    JSON
# dict          ->    object
# list, tuple   ->    array
# str           ->    string
# int, float    ->    number
# True, False   ->    true, false
# None          ->    null

# Serialization/ Encoding - converting a python object/dictionary to a json string
import json

k1_person={"name":"Janav","age":21,"married":False,"address":{"street":"abc","city":"xyz","state":"pqr"}}

k1_personJSON=json.dumps(k1_person) # dumps() function, converts a python object/dictionary to a json string
print("1. ",k1_personJSON,"\n",type(k1_personJSON),"\n")

k2_personJSON=json.dumps(k1_person,indent=4) # indent keyword argument, adds indentation to the json string
print("2.",k2_personJSON,"\n")

k3_personJSON=json.dumps(k1_person, indent=4, separators=(";","=")) # separators keyword argument, changes the separators, not recommended to use
print("3.",k3_personJSON,"\n")

k4_personJSON=json.dumps(k1_person, indent=4, sort_keys=True) # sort_keys keyword argument, sorts the keys alphabetically
print("4.",k4_personJSON,"\n")


# Dumping to a file
with open('persons.json', 'w') as file: # w - write mode
    json.dump(k1_person, file, indent=4)          # dump() function, converts a python object/dictionary to a json string and writes it to a file

1.  {"name": "Janav", "age": 21, "married": false, "address": {"street": "abc", "city": "xyz", "state": "pqr"}}
 <class 'str'>

2. {
    "name": "Janav",
    "age": 21,
    "married": false,
    "address": {
        "street": "abc",
        "city": "xyz",
        "state": "pqr"
    }
}

3. {
    "name"="Janav";
    "age"=21;
    "married"=false;
    "address"={
        "street"="abc";
        "city"="xyz";
        "state"="pqr"
    }
}

4. {
    "address": {
        "city": "xyz",
        "state": "pqr",
        "street": "abc"
    },
    "age": 21,
    "married": false,
    "name": "Janav"
}

# Deserialization/ Decoding - converting a json string to a python object/dictionary
k2_person=json.loads(k1_personJSON) # loads() function, converts a json string to a python object/dictionary
print("5.",k2_person,"\n",type(k2_person),"\n")

# Loading from a file
with open('persons.json','r') as file:               # r - read mode
    k3_person=json.load(file)                        # load() function, converts a json string to a python object/dictionary
    print("6.",k3_person,"\n",type(k3_person),"\n")

5. {'name': 'Janav', 'age': 21, 'married': False, 'address': {'street': 'abc', 'city': 'xyz', 'state': 'pqr'}}
 <class 'dict'>

6. {'name': 'Janav', 'age': 21, 'married': False, 'address': {'street': 'abc', 'city': 'xyz', 'state': 'pqr'}}
 <class 'dict'>

# Class objects are not serializable, so we need to use default keyword argument
# Need to create a function which converts the class object to a dictionary

class User:                               # class
    def __init__(self, name, age):
        self.name=name
        self.age=age

k5 = User("Janav",21)                      # class object

try:                                       # this will give an error
    k5JSON=json.dumps(k5)
except Exception as e:
    print(e)

def encodeUser(obj):                       # function to convert the class object to a dictionary
    if isinstance(obj, User):
        return {"name":obj.name, "age":obj.age, obj.__class__.__name__:True}
    else:
        raise TypeError("Object of type User is not JSON serializable")

k5JSON=json.dumps(k5, default=encodeUser)   # default keyword argument, converts the class object to a dictionary
print("7.",k5JSON,"\n")

Object of type User is not JSON serializable
7. {"name": "Janav", "age": 21, "User": true}

# Second way to encode the class object to a dictionary

from json import JSONEncoder

class UserEncoder(JSONEncoder):                 # UserEncoder class, inherits from the JSONEncoder class
    def default(self, obj):                     # default method of the JSONEncoder class is overridden
        if isinstance(obj, User):               # isinstance() function, returns true if the object is an instance of the class
            return {'name':obj.name,
                    'age':obj.age,
                    obj.__class__.__name__:True
                    }                           # return a dictionary
        return JSONEncoder.default(self, obj)   # return the default method of the JSONEncoder class}

k6JSON=json.dumps(k5, cls=UserEncoder)          # cls keyword argument, converts the class object to a dictionary
print("8.",k6JSON,"\n")

k7JSON=UserEncoder().encode(k5)                # encode() method, converts the class object to a dictionary
print("9.",k7JSON,"\n")

8. {"name": "Janav", "age": 21, "User": true}

9. {"name": "Janav", "age": 21, "User": true}