[Tutor] Insert elements in a lis

[Alan Gauld]

> Is it possible to insert elements in a list in an easy way?

>>> print [1,3,5].insert(1,2)
[1,2,3,5]

Is that easy enough? :-)

You can also insert sublists etc too. The official tutor covers 
all this stuff quite well.

There is a trick using slices:

>>> L = [1,3,5]
>>> L[2:2] = [4, 4.5]  # insert a sequence
>>> print L
[1, 3, 4, 4.5, 5]

The trick is to remember that slices  effectively point 
*between* the members so [2:2] points to the region from
"just before 2" to "just before 2" - ie between 1 and 2...

Think about it :-)

HTH,

Alan G
Author of the Learn to Program web tutor
http://www.freenetpages.co.uk/hp/alan.gauld/tutor2/