Coding

Difference between == and is operator in Python

The == operator compares the values of both the operands and checks for value equality. Whereas is operator checks whether both the operands ask an equivalent object or not.

# python3 code to  
# illustrate the  
# difference between 
# == and is operator 
# [] is an empty list 
list1 = [] 
list2 = [] 
list3=list1 
  
if (list1 == list2): 
    print("True") 
else: 
    print("False") 
  
if (list1 is list2): 
    print("True") 
else: 
    print("False") 
  
if (list1 is list3): 
    print("True") 
else:     
    print("False") 

OUTPUT :

True
False
True
  • Output of the primary if condition is “True” as both list 1 and list 2 are empty lists.
  • Second if condition shows “False” because two empty lists are at different memory locations. Hence list 1 and list 2 ask different objects. we will check it with id () function in python which returns the “identity” of an object.
  • Output of the third if condition is “True” as both list 1 and list 3 are pointing to an equivalent object.
list1 = [] 
list2 = [] 
  
print(id(list1)) 
print(id(list2)) 

OUTPUT :

139877155242696
139877155253640

 

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