List Methods

Python has built-in methods that are designed to perform operations on lists. For append adds a new element to the end of a list:

>>>t = ['a','b','c']

>>>t.append('d')

>>>print t

['a', 'b', 'c', 'd']

Extend method takes a list as an argument and appends all of the elements:

t1 = ['a', 'b', 'c']

t2 = ['d', 'e']

t1.extend(t2)

print t1

['a', 'b', 'c', 'd', 'e']

Sort method arranges the elements of the list from low to high:

>>> t = ['b', 'c', 'a', 'z', 'd']

>>> t.sort()

>>> print t

['a', 'b', 'c', 'd', 'z']

Most list methods are void type. This means that they don’t return any result at all (shortly they return None type). If you write t = t.sort(), you will be disappointed with the result.

>>> t = t.sort()

>>> t