Python id() built-in function
From the Python 3 documentation
Return the “identity” of an object. This is an integer which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same id() value.
>>> id(1) # 9788960 >>> id('1') # 140269689726000 >>> id([1, 2]) # 140269672924928
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