[Tutor] Copying list contents

[alan.gauld@bt.com]

> Python treates the lists like objects

All python variables are references, regardless of the 
object to which they point.

> def copylist(a):
     return a[:]  # list slicing the whole list creates a copy.

The map and filter functions can also be used to copy lists
with various element modifications applied en route.

And zip() can be used to join lists together.

> but I'm working with lists of lists of lists...

There is also a deepcopy module for copying nested lists.

Alan g.
Author of the 'Learning to Program' web site
http://www.freenetpages.co.uk/hp/alan.gauld