[Python-Dev] partition() (was: Remove str.find in 3.0?)

[Pierre Barbier de Reuille]

Eric Nieuwland a écrit :
> I have some use cases with:
> 	cut_at = some_str.find(sep)
> 	head, tail = some_str[:cut_at], some_str[cut_at:]
> and:
> 	cut_at = some_str.find(sep)
> 	head, tail = some_str[:cut_at], some_str[cut_at+offset:] # offset != 
> len(sep)
> 
> So if partition() [or whatever it'll be called] could have an optional 
> second argument that defines the width of the 'cut' made, I would be 
> helped enormously. The default for this second argument would be 
> len(sep), to preserve the current proposal.

Well, IMO, your example is much better written:

import re
rsep = re.compile(sep + '.'*offset)
lst = re.split(resp, some_str, 1)
head = lst[0]
tail = lst[1]

Or you want to have some "partition" method which accept regular
expressions:

head, sep, tail = some_str.partition(re.compile(sep+'.'*offset))

> 
> --eric
> 
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-- 
Pierre Barbier de Reuille

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