List in Python

A list is an Python-object which can contain many different types of elements inside it like integer, characters or array and even another list inside it. Lists are sometimes called recursive, because a list can contain other lists. This makes them fundamentally different from others.

Syntax

lst = []

Code Snippet

languages = ["C", "C++", "Perl", "Python"]

for letter in languages:

 print letter

 

Note: we can also delete element form the list using “del” command with index

del languages[1]

for letter in languages:

 print letter

List Manipulation functions

cmp(list1, list2)     Comparing the two list A negative number if list1 is less than

                             list2 or Zero if list1 is equal to list2 or A positive number

if list1 is greater than list2.

len(list)                 Returns the length of the list

list.count(x)           Returns the number of occurrences of x in list

list.index(x)           Returns the index of the first occurrence of x in list 

list.append(x)        Appends x to the end of list

list.extend(l)         Appends all the items of list l to the end of list

list.insert(i,x)        Inserts x at index i in list

list.remove(x)        Removes the first occurrence of x from list

list.pop(i=-1)         Returns the value of the item at index i and removes it from list

list.reverse( )        Reverses, in-place, the items of list

list.sort(f=cmp)     Sorts, in-place, the items of list, comparing items by f