In the previous tutorial, you learned how to use in-built string methods in your Python program. But, In this post, you will learn everything about python built-in list methods/functions.
If you want to know more about python lists click here.
Python list built-in Functions/Methods
Python provides many in-built methods/functions for list, which is work with python list datatype. And you can modify and manipulate python lists by using built-in lists methods/functions of these pythons.
We have provided a list below. Almost all built-in lists methods/functions python are there:
| Method | Description |
|---|---|
| append() | Adds an element at the end of the list |
| clear() | Removes all the elements from the list |
| copy() | Returns a copy of the list |
| count() | Returns the number of elements with the specified value |
| extend() | Add the elements of a list (or any iterable), to the end of the current list |
| index() | Returns the index of the first element with the specified value |
| insert() | Adds an element at the specified position |
| pop() | Removes the element at the specified position |
| remove() | Removes the first item with the specified value |
| reverse() | Reverses the order of the list |
| sort() | Sorts the list |
The built-in lists methods/functions of Python are given above in the list. Understand those built-in lists methods/functions python with their definition and example.
And know how to use the built-in lists methods/functions of these python methods with the list.
Python append method
The append() function is used to add items to the Python list. And the item is added to the end of the list.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
my_list.append(100)
print(my_list)
#Output
#[10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
Python clear list method
The python clear() method is used to removes all the elements from a list.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
my_list.clear()
print(my_list)
#Output
#[]
List copy method in python
The copy() function copies one list into another list.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
blist= my_list.copy()
print(blist)
#output
# [10, 20, 30, 40, 50, 60, 70, 80, 90]
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List count method in list in python
The count() method returns the number of elements with the specified value.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90,10, 20, 10]
blist= my_list.count(10)
print(blist)
#output
# 3
List extend method in python
In Python, the Extend () method is used to add specific list items to the current list.
a = [1, 2, 3]
b = [4, 5, 6]
a.extend(b)
print(a)
#ouput
#[1, 2, 3, 4, 5, 6]
List index method in python
The index() method is used to find the first occurrence of the specified value.
a = [1, 2, 3, 2, 5, 6, 7, 2]
x = a.index(2)
print(x)
#output
#1
Python List insert() Method
The insert() method is used to insert the specified element at the specified position in the python list.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
my_list.insert(1, 5)
print(my_list)
#Output
#[10, 5, 20, 30, 40, 50, 60, 70, 80, 90]
List pop() Method in Python
The pop() method used to remove the element at the specified position in python list.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
my_list.pop(2)
print(my_list)
#[10, 20, 40, 50, 60, 70, 80, 90]
List remove method in python
The remove() method is used to remove the first occurrence item with a specified value on python lists.
# list of integers
my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90]
my_list.remove(90)
print(my_list)
#output
# [10, 20, 30, 40, 50, 60, 70, 80]
Python list reverse method
The reverse() method is used to reverse the sorting order of the elements.
x = [1, 2, 3, 4, 5]
x.reverse()
print(x)
#Output
#[5, 4, 3, 2, 1]
Python sort list method
The sort() method sorts the list ascending by default.
x = [6, 7, 1, 5, 4, 8]
x.sort()
print(x)
#Output
#[1, 4, 5, 6, 7, 8]
