Answer Posted / chaitanya

Python arrays & list items can be accessed with positive or negative numbers (also known as index).

For instance our array/list is of size n, then for positive index 0 is the first index, 1 second, last index will be n-1. For negative index, -n is the first index, -(n-1) second, last negative index will be – 1.

A negative index accesses elements from the end of the list counting backwards.

An example to show negative index in python

>>> import array

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

>>> print a[-3]

1

>>> print a[-2]

2

>>> print a[-1]

3

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