Interview question

What is the difference between == and is in Python? Python में == और is में क्या अंतर है?

Answer

Operator	Checks
==	Value equality - do the objects contain the same value?
is	Identity equality - are they the SAME object in memory?

a = [1, 2, 3]
b = [1, 2, 3]
c = a

print(a == b)  # True - same values
print(a is b)  # False - different objects in memory
print(a is c)  # True - c points to the SAME object as a

# Small integer caching - CPython caches small ints (-5 to 256)
x = 100
y = 100
print(x is y)  # True - both point to the same cached int object

x = 1000
y = 1000
print(x is y)  # False (usually) - large ints not cached, separate objects

# Best practice: use 'is' only for None, True, False comparisons
if a is None:
    print('a is None')

Operator	क्या check करता है
==	Value equality - same values हैं?
is	Identity equality - memory में same object हैं?

a = [1, 2, 3]
b = [1, 2, 3]
c = a

print(a == b)  # True - same values
print(a is b)  # False - अलग objects
print(a is c)  # True - same object

# Small integer caching
x = 100
y = 100
print(x is y)  # True - cached

# Best practice: 'is' सिर्फ None, True, False के लिए
if a is None:
    print('a is None')

Was this answer clear?

Subjects

Related questions