Slicing a list with non-integer parameter? How?

[Chris Liechti]

Husam <h.jehadalwan at student.kun.nl> wrote in 
news:3BBF216D.25524AAB at student.kun.nl:

> Hi fiends,
> I'm trying to determine the position of an item in a list in order to
> delete it by slicing the list with non integer parameter.
> Code I works just fine. But code II doe's not work:
> 
> Code 1 with integer values:
> 
>>> list1=[1,2,3,4]
>>>> for i in list1:
> ...     if i==2:
> ...             pos=len(list)-len(list[i:])
> ...             del list[pos-1]
> ...             print list
> ...
> [1, 3, 4]

for "iterates" over the list, meaning that you get one element after the 
other. if your list has strings in it, then "i" is also a string. in your 
case you might consider:

for pos in range(len(list)):
    	item = list[pos]
    	#...

1. you have an integer to use it as index
2. you dont need to do the "pos" calculation

an other point:
deleting items in the list your working on is usualy a bad idea. its better 
when you delete the items in a copy of the list:

copylist = list(origlist)

(don't name your variable "list" as this is a builtin function to convert 
something to a list)

and as another poster Wmile van Sebille mentioned already, there is:

list1.remove(element)

which does what you want.

Chris

-- 
Chris <cliechti at gmx.net>