list pop

 >>> a = [1, 2, 3, 4, 2, 6, 7] # Initailized a list
>>> a.pop() # Removes the element at index -1(i.e. at last place)
7
>>> print a
[1, 2, 3, 4, 2, 6]
>>> a.pop(4) # Removes the element at index 4
2
>>> print a
[1, 2, 3, 4, 6]
>>> a.pop(100) # Index out of range.
IndexError: pop index out of range