[Python-Dev] conditional expressions - add parens?
steve at holdenweb.com
Mon Mar 6 22:34:51 CET 2006
Jim Jewett wrote:
> Now that we have started to see conditional expressions ... I would
> like to see them parenthesized. The parens aren't as important as they
> are with generator expressions, but ... they matter.
> From a recent checkin --
> level = 0 if "absolute_import" in self.futures else -1
Personally I think the above code exemplifies exactly why Guido was
correct in his reluctance to add conditional expressions.
> Mentally, I can't help parsing that as "level = 0" plus comments that
> turn out to be code that triggers backracking.
> When the expressions (particularly the true case) are longer, it gets
> even worse.
> I think that adding parentheses would help, by at least signalling that
> the logic is longer than just the next (single) expression.
> level = (0 if "absolute_import" in self.futures else -1)
Contrast with the bleeding obvious:
level = 0
if "absolute_import" in self.futures:
level = -1
or even, if a certain obscurity is desirable:
level = - ("absolute_import" in self.futures)
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd www.holdenweb.com
Love me, love my blog holdenweb.blogspot.com
More information about the Python-Dev