Python Programming – Updating List Elements

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Python Programming – Updating List Elements

Updating list elements

It is possible to change individual or multiple elements of a list:

>>> a= [ ' spam ' , ' eggs ' , 100 , 1234 ]
>>> a [ 0 ]= ' filter '
>>> a
[ ' filter ' , ' eggs ' , 100 , 1234 ]
>>> a [ 2 : 4 ]= 455 , 56858 
>>> a
[ ' filter ' , ' eggs ' , 455 , 56858 ]

The items of list can be updated by the elements of another iterable (list, tuple).

>>> a= [ 66 . 25 , 333 , 333 , 1 , 1234 . 5 ]
>>> b=[ ' hi ' , ' bye ' ]
>>> a [ 2 : 4 ] =b 
>>> a
[ 66 . 25 , 333 , ' hi ' , ' bye ' , 1234 . 5 ]
>>> a= [ 66 . 25 , 333 , 333 , 1 , 1234 . 5 ]
>>> b= ( ' hi ' , ' bye ' )
>>> a [ 2 : 4 ]=b 
>>> a
[ 66 . 25 , 333 , ' hi ' , ' bye ' , 1234 . 5 ]
>>> a= [ 66 . 25 , 333 , 333 , 1 , 1234 . 5 ]
>>> b= [ ' hi ' , ' bye ' ] 
>>> a [ 1: 4 : 2 ] =b 
>>> a
[ 66 . 25 , ' hi ' , 333 , ' bye ' , 1234 . 5 ]

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It is also possible to insert elements in a list.

>>> a=[ ' spam ' , ' eggs ' , 100 , 1234 ]
>>> a [ 1 : 1 ]=[ ' chair ' ]
>>> a
[ ' spam ' , ' chair ' , ' eggs ' , 100 , 1234 ]
>>> a [ 1 : 1 ] = [ ' hello ', ' bye ' ]
>>> a
[ ' spam ' , ' hello ' , ' bye ' , ' chair ' , ' eggs ' , 100 , 1234 ]

To insert a copy of the list at the beginning of itself:

>>> a= [ ' spam ' , ' eggs ' , 100 , 1234 ]
>>> a [ : 0 ]=a 
>>> a
[ ' spam ' , ' eggs ' , 100 , 1234 , ' spam ' , ' eggs ' , 100 , 1234 ]

There are various methods of list objects for updating the list, which is discussed in section 4.1.9.