How to do this in Python...
Erik Max Francis
max at alcyone.com
Fri Jan 24 01:58:26 CET 2003
Michael Tiller wrote:
> I'm puzzled by what seems like a missing piece of functionality in
> I suspect there is a simple way to do what I want to do and I'm
> someone here can point it out to me. Here is the issue:
> In C++, I could write a statement like this:
> if (match=re.match(pattern, string))
> // do something with the match object
> But I cannot figure out how to do the equivalent thing in Python.
You cannot (without winning obfuscation contests, anyway). Assignment
is a statement, and if expects expressions. This was done as a
deliberate act to avoid the common newbie mistake in C or C++ of writing
if (a = b) ...
when you meant
if (a == b) ...
Whether or not you agree with the philosophy behind the decision, it's
in the language. The Pythonic way to do the same thing is an assignment
and then a separate test:
a = b
if a: ...
Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
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