freeCodeCamp/guide/english/python/difference-between-is-and-equal-equal-operators/index.md

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Difference between Python 'is' and '==' operators

is is a check for object identity - ie, checking if two or more variables are referring to the same object. You can't overload is. That object identity is established and assigned with =.

== evaluates to true if object referred to by the variables are equal. You can overload == via the __eq__ operator.

Return Value

The return value for both would be either True or False.

Code Sample

a = 2.3
a is 2.3  # => False
a == 2.3  # => True

a = [234,123,321]
b = [234,123,321]
a == b  # => True
a is b  # => False
a = b
a == b  # => True
a is b  # => True, because if we change a, b changes too