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List Methods in Python | Set 2 (del, remove(), sort(), insert(), pop(), extend()…)

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Some of the list methods are mentioned in set 1 below List Methods in Python | Set 1 (in, not in, len(), min(), max()…) More methods are discussed in this article. 1. del[a : b] :- This method deletes all the elements in range starting from index ‘a’ till ‘b’ mentioned in arguments. 2. pop() :- This method deletes the element at the position mentioned in its arguments.
# Python code to demonstrate the working of
# del and pop()
  
# initializing list 
lis = [2, 1, 3, 5, 4, 3, 8]
  
# using del to delete elements from pos. 2 to 5
# deletes 3,5,4
del lis[2 : 5]
  
# displaying list after deleting 
print ("List elements after deleting are : ",end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")
      
print("\r")
  
# using pop() to delete element at pos 2
# deletes 3
lis.pop(2)
  
# displaying list after popping  
print ("List elements after popping are : ", end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")

                    
Output:
List elements after deleting are : 2 1 3 8 
List elements after popping are : 2 1 8 

3. insert(a, x) :- This function inserts an element at the position mentioned in its arguments. It takes 2 arguments, position and element to be added at respective position. 4. remove() :- This function is used to delete the first occurrence of number mentioned in its arguments.
# Python code to demonstrate the working of
# insert() and remove()
  
# initializing list 
lis = [2, 1, 3, 5, 3, 8]
  
# using insert() to insert 4 at 3rd pos
lis.insert(3, 4)
  
# displaying list after inserting
print("List elements after inserting 4 are : ", end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")
      
print("\r")
  
# using remove() to remove first occurrence of 3
# removes 3 at pos 2
lis.remove(3)
  
# displaying list after removing 
print ("List elements after removing are : ", end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")

                    
Output:
List elements after inserting 4 are : 2 1 3 4 5 3 8 
List elements after removing are : 2 1 4 5 3 8 

5. sort() :- This function sorts the list in increasing order. 6. reverse() :- This function reverses the elements of list.
# Python code to demonstrate the working of
# sort() and reverse()
  
# initializing list 
lis = [2, 1, 3, 5, 3, 8]
  
# using sort() to sort the list
lis.sort()
  
# displaying list after sorting
print ("List elements after sorting are : ", end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")
      
print("\r")
  
# using reverse() to reverse the list
lis.reverse()
  
# displaying list after reversing
print ("List elements after reversing are : ", end="")
for i in range(0, len(lis)):
    print(lis[i], end=" ")

                    
Output:
List elements after sorting are : 1 2 3 3 5 8 
List elements after reversing are : 8 5 3 3 2 1 

7. extend(b) :- This function is used to extend the list with the elements present in another list. This function takes another list as its argument. 8. clear() :- This function is used to erase all the elements of list. After this operation, list becomes empty.
# Python code to demonstrate the working of
# extend() and clear()
  
# initializing list 1
lis1 = [2, 1, 3, 5]
  
# initializing list 1
lis2 = [6, 4, 3]
  
# using extend() to add elements of lis2 in lis1
lis1.extend(lis2)
  
# displaying list after sorting
print ("List elements after extending are : ", end="")
for i in range(0, len(lis1)):
    print(lis1[i], end=" ")
      
print ("\r")
  
# using clear() to delete all lis1 contents
lis1.clear()
  
# displaying list after clearing
print ("List elements after clearing are : ", end="")
for i in range(0, len(lis1)):
    print(lis1[i], end=" ")

                    
Output:
List elements after extending are : 2 1 3 5 6 4 3 
List elements after clearing are : 
Related articles: List methods in Python List Methods in Python | Set 1 (in, not in, len(), min(), max()…)


Last Updated : 18 Sep, 2018
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