[Greg Ward]
> Hmmm, a random idea: has filter() ever been used for anything else?
> I didn't think so. So why not remove everything *except* that handy
> special-case: ie. in 3.0, filter(seq) == filter(None, seq) today, and
> that's *all* filter() does.
>
> Just a random thought...
It's been used for lots of other stuff, but I'm not sure if any other use
wouldn't read better as a listcomp. For example, from spambayes:
def textparts(msg):
"""Return a set of all msg parts with content maintype 'text'."""
return Set(filter(lambda part: part.get_content_maintype() == 'text',
msg.walk()))
I think that reads better as:
return Set([part for part in msg.walk()
if part.get_content_maintype() == 'text'])
In Python 3.0 that will become a set comprehension <wink>:
return {part for part in msg.walk()
if part.get_content_maintype() == 'text'}
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