Python List Methods

Python List Methods

Python has a set of built-in methods that you can use on lists or arrays. Following are all of the methods of list objects:

Methods	Explanation
append	The list.append() method adds an item to the end of the list.
extend	The list.extend() method extends the list by appending all the items from the iterable.
insert	The list.insert() method adds an element at the specified position
remove	The list.remove() method removes the first item with the specified value
pop	The list.pop() method removes the element at the specified position of the list.
Clear	The list.clear() method removes all the elements from the list
Index	The list.index() method returns the index of the first element with the given list value.
Count	The list.count() method returns the number of times x appears in the list.
Sort	This method sorts the items of the list
Reverse	This method reverses the elements of the list in place.
Copy	The list.copy() method returns a copy of the specified list.

Example 1

 # Python program explaining
 # the list methods
 # list.append() method
 week_list = ["Monday", "Tuesday", "Wednesday","Thursday","Friday", "Saturday"]
 print("List before calling append() method\n", week_list)
 # appending sunday at the end of the list
 week_list.append("Saturday")
 print("List after calling append() method")
 print(week_list)
 #list.extend() method
 str_list = ['The odd number', 'are:'] 
 num_list = [1, 3, 5, 7, 9] 
 str_list.extend(num_list) 
 print ("The extended list:",str_list)
 # list.remove() methods
 num_list.remove(5)
 num_list.remove(9)
 print("After removing the 5,9 values:",num_list) 

Output

 List before calling append() method
  ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
 List after calling append() method
 ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Saturday']
 The extended list: ['The odd number', 'are:', 1, 3, 5, 7, 9]
 After removing the values: [1, 3, 7] 

Example 2

 # Python program explaining
 # the list methods
 # the list.pop() method
 fruits = ['apple', 'banana', 'cherry']
 print("List: ",fruits)
 #removing the first element from the list
 fruits.pop(1)
 print("After removing the first element ")
 print("List: ",fruits)
 # list.index() method
 # printing the index of 'cherry' in fruits list  
 print("The index value of string value 'cherry': ",fruits.index('cherry'))
 # list.clear() method
 fruits.clear()
 print("After calling the clear() method..")
 print("fruits list:",fruits) 

Output

 List:  ['apple', 'banana', 'cherry']
 After removing the first element 
 List:  ['apple', 'cherry']
 The index value of string value 'cherry':  1
 After calling the clear() method..
 fruits list: [] 

Example 3

 # Python program explaining
 # the list methods
 # passing the alphabets list
 alphaList = ['b', 'a', 'e', 'd', 'c']
 print("Actual list: ",alphaList)
 # sort the alphabets list in the ascending order
 alphaList.sort()
 # priningt the list in a sorted order
 print('Sorted list:',alphaList)
 # list.reverse() method
 # reversing the order of the alpha list
 alphaList.reverse()
 print('Reversed list:',alphaList)
 # the list.copy() method
 # copying the the old list
 newList= alphaList.copy()
 print("New List: ", newList) 

Output

 Actual list:  ['b', 'a', 'e', 'd', 'c']
 Sorted list: ['a', 'b', 'c', 'd', 'e']
 Reversed list: ['e', 'd', 'c', 'b', 'a']
 New List:  ['e', 'd', 'c', 'b', 'a']