Why do python list with a single entry give the 0th element for -1 index and 0 index?

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On creating a
list in python with just one element, when I try to get the -1 index element instead of
getting list index out range error it is giving the 0th
element.

some =
            ['something']
print(some[0]) # prints something
print(some[-1]) #
            prints
            something

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class="normal">Answer

A negative
index means nth from the right. The zero-index of a one-element
list is the same as the negative one-index of a one-element list because the zeroeth
element is the same as the first element from the right.