How to modify multiple element in python list

If we want to change multiple elements in list at one time we use : operator.

Example for modify multiple element in python list

#1 Example :-

list1 = [ 1, 2, 3, 4, 5 ]

list1[ 2 : 4 ] = [ 10, 20, 30 ]

print( list1 )

Output

[ 1, 2, 10, 20, 30, 5 ]

Note :- Here we can see that we have replaced three elements in list. The only thing we have to remember is that in list1[2 : 4], 2 is indexing and 4 is elements of the list from left.

#2 Example :-

The number of elements inserted need not equal to number of elements replaced. Python can grows or shrinks the list as per requirements.

list2 = [ 10, 20, 30]

list2[ 1:3 ] = [ 5, 15, 25, 35 ]

print( list2 )

Output

[ 10, 5, 15, 25, 35 ]

Note:- Here we can see the number of elements we want to insert is 4 and the number of elements replaced is 2.

#3 Example

We can also replace a single element with more than one element. 

list3 = [ ‘a’, ‘b’, ‘c’, ‘d’ ]

list3[ 2 ] = [ 10, 20, 30 ]

print( list3 )

Output

[ ‘a’, ‘b’, 10, 20, 30, ‘d’ ]

#4 Example :-

We can also insert element without replacing any element.

list4 = [ 10, 20, 30 ]

list4[ 2:2 ] = [ 1, 2, 3 ]

print( list4 )

Output

[ 10, 20, 1, 2, 3, 30 ]

You have learned how to modify multiple element in python list

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