Filter function and lists
Terry Reedy
tjreedy at udel.edu
Wed Oct 29 17:28:16 EDT 2008
John Townsend wrote:
> I’m trying to figure out how to use filter to walk through a list.
>
> If I try a simple scripts like this:
>
> def greaterthanten (number):
> #pdb.set_trace()
> if (number > 10):
> ret_val = 1
>
> else:
> ret_val = 0
>
> return ret_val
>
> old_list = [1,2,20,30,5]
>
> new_list = filter(greaterthanten, old_list)
>
> #new_list becomes [20, 30]
>
> The script works as I would expect. However, what if I need to pass more
> than one argument to the function? Can I do that with filter? Or does
> filter work only with function that take only a single arg?
The latter. Other functions could be wrapped to bind all parameters
except the list element. Or write an explicit loop.
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