[Python-Dev] conditional expressions - add parens? (original) (raw)

Jiwon Seo seojiwon at gmail.com
Thu Mar 9 09:25:24 CET 2006

With parentheses, we can use "if cond then val1 else val2" form without the burden of hacking the parser, although the cost of the keyword "then" is still there. so, some possible forms that prompts in my mind are

level = (if "absolute_import" in self.future then 0 else -1)
level = (if "absolute_import" in self.future: 0 else: -1)
level = (0 if "absolute_import" in self.future else -1)

-Jiwon

On 3/7/06, Jeremy Hylton <jeremy at alum.mit.edu> wrote:

On 3/6/06, Alex Martelli <aleaxit at gmail.com> wrote: > > On Mar 6, 2006, at 9:17 AM, Jim Jewett wrote: > ... > > 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 "absoluteimport" in self.futures else -1) > > +1 (just because I can't give it +3.1415926...!!!). Mandatory > parentheses make this form MUCH more readable.

Recent language features seem to be suffereing from excessive parenthesisitis. I worry that people will stop remembering which expressions requirement parens in which context. Perhaps the solution is to require parens around all expressions, a simple consistent rule. If so, then adding parens around all statements is a fairly natural extension, which solves a number of problems like how to make a richer lambda. Jeremy

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