List Functions and methods in Python
Hi guys in this blog we are going to discuss about List methods in Python List | Functions and methods in Python
List Functions
Python also offers many built-in functions and methods for list manipulation. These can be applied to list as per following syntax :
<listObject>.<method name>()
1.The index method
This function returns the index of first matched item from the list.
List.index (<item>) For example, for a list L1 = [13, 18, 11, 16, 18, 14),
>>> L1.index (18)
returns the index of first value 18, even if there is another value 18 at index 4.
2. The append method
The append() method adds an item to the end of the list. It works as per following syntax:
List.append(<item>
- Takes exactly one element and returns no value
For example, to add a new item "yellow" to a list containing
>>> colours = ['red', 'green', 'blue']
>>> colours.append('yellow)
>>> colours
['red', 'green', 'blue', 'yellow]
3. The extend method
The extend() method is also used for adding multiple elements (given in the form of a list) to a list.
The extend() function works as per following
List.extend<list>
That is extend() takes a list as an argument and appends all of the elements of the argument list to the list object on which extend() is applied. Consider the following example:
>>> t1 = ['a', 'b', 'c']
>>>t2 = ['d', 'e']
>>> t1.extend(t2)
['a', 'b', 'e', 'd', 'e']
>>>t2
4. The insert method
The insert() function inserts an item at a given position. It is used as per following syntax:
List.insert( <pos>, <item>)
- Takes two arguments and returns no value.
The first argument <pos> is the index of the element before which the second argument <item> is to be added. Consider the following example:
>>> t1 = ['a', 'e', 'u']
>>> ti.insert(2, '1')
['a', 'e', 'T', 'u]
5. The pop method
The pop() is used to remove the item from the list. It is used as per following syntax:
List.pop(<index>)
The remaining methods in List are
6.remove()
7.clear()
8.count()
9.reverse()
10.sort()
Will Discuss in next post about these methods in list
