Original: Python Tricks Book

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# "is" vs "=="

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

>>> a is b
True
>>> a == b
True

>>> c = list(a)

>>> a == c
True
>>> a is c
False

# * "is" expressions evaluate to True if two 
#   variables point to the same object

# * "==" evaluates to True if the objects 
#   referred to by the variables are equal

Se você gostou dessa dica, você vai adorar este livro: Python Tricks: The Book