[Tutor] Changing lists in place

[Paul D. Eden]

Lists are mutable, you are right.

But the code you gave does not change the list.  It changes the variable 
element which is separate from the list myList.

If you want to change the list try something like this:

mylist = [ 'One    ', '   two', '   three   ' ]
print mylist
newlist = []
for element in mylist:
     element = element.strip()
     newlist.append(element)
     print "<>" + element + "<>"
print newlist

OR

mylist = [ 'One    ', '   two', '   three   ' ]
print mylist
mylist = [element.strip() for element in mylist]
for element in mylist:
     print "<>" + element + "<>"
print mylist

Paul

Paul D. Kraus wrote:
> I have a list that I want to change in a for loop. It changes in the 
> loop but the changes are not persistant outside of the loop.
> I thought lists were mutuable objects so I am a bit confused.
> 
> Sample Code....
> #!/usr/bin/env python
> """ Testing lists """
> 
> mylist = [ 'One    ', '   two', '   three   ' ]
> print mylist
> for element in mylist:
>     element = element.strip()
>     print "<>" + element + "<>"
> print mylist
> 
> 
> Sample Output....
> ['One    ', '   two', '   three   ']
> <>One<>
> <>two<>
> <>three<>
> ['One    ', '   two', '   three   ']
> 
> 
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