There is a method "insert()" for the list data type. You can use the method to insert an item at a particular location.
list.insert(i, x), where i=position and x=new item
E.g.
>>> a=[11,23,345,56,23]
>>> a.insert(2,45)
>>> a
[11, 23, 45, 345, 56, 23]
>>>