[Tutor] Removing itens from a list

[Tom Jenkins]

Hello and welcome,

On Tue, 2002-01-15 at 12:36, Marco A. Sousa wrote:
> Hi. This is my first message to this great list. Wish I find out about 
> you before :) Sorry for my english, we speak portuguese here.
> 
> 
> My question is:
> 
> In the following list,how do I remove every item with "orange" on it?
> l = ['I like Orange juice','orange','OranGes are good','I like apple']
> 
> 
> I think I should use re module, but dont now how to use it. 
> Do you know any site that explain the use of re module or regex with python ?

you could use a regular expression however i would use a list
comprehension (assuming python 2.x)

results = [x for x in l if x.lower().find('orange') == -1]

what is going on here is 
- we loop over 'l' putting the item in 'x'
- call lower() on x which lowercases the string
- call find('orange') on the lowercased string.  if the return value of
that call is -1 then 'orange' does not appear in the string
- check our return value from find() against -1, if they are equal then
append the value of 'x' into our new list




> 
> Thanks in advance, and keep up the good work. You guys are *really* making
> a difference.
> 
> -- 
> Buy a copy of a baby naming book and you'll never be at a loss for 
> variable names.
> - How To Write Unmaintainable Code
> 
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-- 

Tom Jenkins
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