Another conditional expression candidate (PEP 308)

[Erik Max Francis]

Evan wrote:

> x = (if a > 0: 'positive' elif a == 0: 'zero' else: 'negative')
> 
> The parentheses and 'else:' clause are mandatory.

I suggested the same in these recent PEP threads as well.

> This has been proposed in the past ... and I can't find any specific 
> objections to it, other than someone 
> uncomfortable with the idea of mandatory parentheses.

In the recent threads, the main objection that seemed to be raised was
that of a general trend of expressionizing statements.  Others also
expressed some displeasure at the required parentheses.  I don't know if
that's really all that bad; the required brackets in list
comprehensions, for instance, are damn helpful in setting them off as in
"something special happens in here."

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