[Python-Dev] Adding a conditional expression in Py3.0

[Reinhold Birkenfeld]

Jason Orendorff wrote:

> Honestly, I think I would prefer this syntax.  Examples from real
> code, before and after:
> 
>     lines = [line for line in pr.block.body
>              if line.logical_line.strip() != '']
>     lines = [for line in pr.block.body:
>                  if line.logical_line.strip() != '':
>                      line]
> 
>     row.values = \
> 	[line[col.start:col.end].strip() for col in columns]
>     row.values = \
> 	[for col in columns: line[col.start:col.end].rstrip()]
> 
>     return [p for p in self.listdir(pattern) if p.isdir()]
>     return [for p in self.listdir(pattern): if p.isdir(): p]

-1. Too much similarity with the for/if statement. People would say
"why can we put a for statement in brackets but not a try statement".

Reinhold

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