is , not is ( Identity Operators)
x is yReturn boolean value True or False. Returns True if both side operands are of same identity, otherwise False
x is not yReturn boolean value True or False. Returns True if both side operands are NOT of same identity, otherwise False
a=30
b=30
print(a is b ) # True
a=300
b=300
print(a is b ) # Falseprint() returns False ? Identity of the object changed in second case ( Why ?) . (For integer -5 to 256, id will not change.).
By using is we are checking the identity of the object Not the Value so we got False in second case ( Identity remain same for integers between -5 and 256 ) .
Difference between id and value
Our is operator checks the identity only , not the value of the object.Example 1
a=-6
b=-6
print("Using is :",a is b)
print("using == :",a==b)Using is : False
using == : Truea=30
b=30
print(a is b ) # True
a=300
b=300
print(a is b ) # False
print(a == b ) # TrueOur is operator checks the identity of the variables, == operator checks the value.
Using type of the object
x=500
print(type(x) is int) # Truex=100.34
print(type(x) is int) # Falsex=100.34
print(type(x) is float) # Truex=30
y=400
print(type(x) is type(y)) # TrueUsing list
More on listExample
my_list1=[1,2,3]
my_list2=[4,5,6]
print(type(my_list1) is type(my_list2)) # Truemy_list1=[1,2,3]
my_list2=frozenset([4,5,6])
print(type(my_list1) is type(my_list2)) # Falsex=True
y=False
print(type(x) is type(y)) # TrueExample using is not
x=56.78
y=100
print((x is not y)) # TrueAll Python Operators
in and not in: The Membership operators id() Iterator any() type()
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