You can update single or multiple elements of lists by giving the slice on the left-hand side of the assignment operator, and you can add to elements in a list with the append() method. Following is a simple example:

# !/user/bin/python 

list = [‘physics’, ‘chemistry’, 1997, 2000]; 

print “Value available at index 2 :” 

print list[2]; 

list [2] = 2001; 

print “New value available at index 2 :” 

print list [2];

When the above code is executed it produces the following result:

Value available at index 2 : 

1997 New value available at index 2 : 

2001

Delete List Elements:

To remove a list element, you can use either the del statement if you know exactly which element(s) you are deleting of the remove() method if you do not know.

Following is a simple example : 

# !/user/bin/python 

list1 = [‘physics’, ‘chemistry’, 1997, 2000]; 

print list1; del list1 [2]; 

print “After deleting value at index 2:” 

print list1;

When the above code is executed, it produces the following result:

[‘physics’, ‘chemistry’, 1997, 2001] 

After deleting value at index 2 : 

[‘physics’, ‘chemistry’, 2000]