If you want to update single or multiple elements of lists then you have to provide the slice on the left-hand side of the assignment operator, and to add to elements in a list you can use the append() method. For example
#!/usr/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]
Output will be
Value available at index 2 :
1997
New value available at index 2 :
2001
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