Python Object Comparison : “is” vs “==”

Last Updated : 10 Sep, 2018

Both “is” and “==” are used for object comparison in Python. The operator “==” compares values of two objects, while “is” checks if two objects are same (In other words two references to same object).

# Python program to demonstrate working of  
# "==" 
  
# Two different objects having same values 
x1 = [10, 20, 30] 
x2 = [10, 20, 30] 
  
# Comparison using "==" operator 
if  x1 == x2: 
    print("Yes") 
else: 
    print("No") 

Output:

Yes

The “==” operator does not tell us whether x1 and x2 are actually referring to the same object or not. We use “is” for this purpose.

# Python program to demonstrate working of  
# "is" 
  
# Two different objects having same values 
x1 = [10, 20, 30] 
x2 = [10, 20, 30] 
  
# We get "No" here 
if  x1 is x2: 
    print("Yes") 
else: 
    print("No") 
  
# It creates another reference x3 to same list. 
x3 = x1 
  
# So we get "Yes" here 
if  x1 is x3: 
    print("Yes") 
else: 
    print("No") 
  
# "==" would also produce yes anyway 
if  x1 == x3: 
    print("Yes") 
else: 
    print("No") 

Output:

No
Yes
Yes

x1 = [10, 20, 30] 
  
# Here a new list x2 is created using x1 
x2 = list(x1) 
  
# The "==" operator would produce "Yes" 
if  x1 == x2: 
    print("Yes") 
else: 
    print("No") 
  
# But "is" operator would produce "No" 
if  x1 is x2: 
    print("Yes") 
else: 
    print("No") 

Output:

Yes
No

Conclusion:

“is” returns True if two variables point to the same object.
“==” returns True if two variables have same values(or content).

S

Sabya_Samadder

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Comparison Operators in Python

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