John Machin <sjmac...@lexicon.net> wrote:
> def fancyrepl(tag, replfunc, input_string):
> count = 0
> pieces = []
> pos = 0
> taglen = len(tag)
> while 1:
> try:
> newpos = input_string.index(tag, pos)
> except ValueError:
> pieces.append(input_string[pos:])
> return ''.join(pieces)
> pieces.append(input_string[pos:newpos])
> count += 1
> pieces.append(replfunc(count))
> pos = newpos + taglen
>
Or even:
import re, itertools
def fancyrepl(tag, replfunc, input_string):
counter = itertools.count(1)
return re.sub(re.escape(tag),
lambda m: replfunc(counter.next()), input_string)
which does exactly the same thing in rather less code.
--
Duncan Booth http://kupuguy.blogspot.com
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