Python Basic Data Structures


Python's list is internally implemented as an array. Access an element by an index is O(1).


Negative indices are also allowed. A handy way to access the last element is:

1a = [1, 2, 3]
2print(a[-1])  # print out 3



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

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