Some of the list methods are mentioned in set 1 below
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 :
