Python language hack for C-style programmers [DO NOT USE!] :-)

Chris Angelico rosuav at gmail.com
Thu Mar 27 17:19:40 CET 2014


On Fri, Mar 28, 2014 at 3:08 AM, Tim Chase
<python.list at tim.thechases.com> wrote:
> Multiple times, I've seen someone want something like what C-style
> languages offer where assignment is done in a test, something like
>
>   if (m = re.match(some_string)):
>     do_something(m)

If you want a language where you can do this sort of thing, but the
semantics are like Python's (first-class complex objects, garbage
collection, references instead of pointers, pass-by-object, etc),
check out Pike. Its syntax is very much C's, or C++'s or Java's if you
prefer, but it functions very much the way Python does. You can even -
and you can't do this in C or, to my knowledge, C++ - declare a
variable inside an if, which is valid only in the body of that if:

if (array m = Regexp.split2(some_pattern, some_string))
    do_something(m);

(Minor difference: Regexp.match() just returns boolean true or false,
but .split2() is more like Python's .match(). I'm not sure why there's
the difference.)

ChrisA



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