filter a list of strings
Grobu
snailcoder at retrosite.invalid
Thu Dec 3 07:17:30 EST 2015
On 03/12/15 02:15, c.buhtz at posteo.jp wrote:
> I would like to know how this could be done more elegant/pythonic.
>
> I have a big list (over 10.000 items) with strings (each 100 to 300
> chars long) and want to filter them.
>
> list = .....
>
> for item in list[:]:
> if 'Banana' in item:
> list.remove(item)
> if 'Car' in item:
> list.remove(item)
>
> There are a lot of more conditions of course. This is just example code.
> It doesn't look nice to me. To much redundance.
>
> btw: Is it correct to iterate over a copy (list[:]) of that string list
> and not the original one?
>
No idea how 'Pythonic' this would be considered, but you could use a
combination of filter() with a regular expression :
# ------------------------------------------------------------------
import re
list = ...
pattern = re.compile( r'banana|car', re.I )
filtered_list = filter( lambda line: not pattern.search(line), list )
# ------------------------------------------------------------------
HTH
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