Proposed PEP for a Conditional Expression
tanzer at swing.co.at
Mon Sep 10 08:42:16 CEST 2001
> Michael Chermside wrote:
> [excellent work snipped, as I just want to snipe on one point...]
> > using it may require creating a temporary variable and
> > splitting a formula into two lines, or replacing a lambda
> > expression with a named function.
> I consider that replacing lambda forms with named functions, in Python, is
> an *excellent* practice, which should be encouraged by all means necessary.
> If the lack of a conditional operator does indeed encourage people to
> write more local def's and fewer lambdas, then (to me) that is the "killer
> argument" for not introducing conditional operators.
Conditional expressions provide some nice benefits totally unrelated
One example: with a trivial class, one can put expressions into format
"Found %(number)d error%(if number == 1 : '' else : 's')s" % trivial
This doesn't look too attractive if used in a one-liner, put could be
put to very good use for substitution in bigger templates.
Christian Tanzer tanzer at swing.co.at
Glasauergasse 32 Tel: +43 1 876 62 36
A-1130 Vienna, Austria Fax: +43 1 877 66 92
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