Edward Elliott <[EMAIL PROTECTED]> wrote:
> I'm looking for the "best" way to strip a large set of chars from a filename
> string (my definition of best usually means succinct and readable). I
> only want to allow alphanumeric chars, dashes, and periods. This is what I
> would write in Perl (bless me father, for I have sinned...):
>
> $filename =~ tr/\w.-//cd, or equivalently
> $filename =~ s/[^\w.-]//
>
> I could just use re.sub like the second example, but that's a bit overkill.
> I'm trying to figure out if there's a good way to do the same thing with
> string methods. string.translate seems to do what I want, the problem is
> specifying the set of chars to remove. Obviously hardcoding them all is a
> non-starter.
(untested code, but, the general idea shd be correct)...:
class KeepOnly(object):
allchars = ''.join(chr(i) for i in xrange(256))
identity = string.maketrans('', '')
def __init__(self, chars_to_keep):
self.chars_to_delete = self.allchars.translate(
self.identity, chars_to_keep)
def __call__(self, some_string):
return some_string.translate(self.identity,
self.chars_to_delete)
Alex
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