C-like assignment expression?

[Ulrich Eckhardt]

boblatest at googlemail.com wrote:
> I have an if-elif chain in which I'd like to match a string against
> several regular expressions. Also I'd like to use the match groups
> within the respective elif... block. The C-like idiom that I would
> like to use is this:
> 
> if (match = my_re1.match(line):
>   # use match
> elsif (match = my_re2.match(line)):
>   # use match
> elsif (match = my_re3.match(line))
>   # use match
> 
> ...buy this is illegal in python. The other way is to open up an else:
> block in each level, do the assignment and then the test. This
> unneccessarily leads to deeper and deeper nesting levels which I find
> ugly.

How about this (untested) code:

for re in (re1, re2, re3):
  match = re.match(line)
  if match:
    # use it

This requires that "use it" means the same for each regular expression
though...

Uli

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