[Python-Dev] PEP 377 - allow __enter__() methods to skip the statement body

[Baptiste Carvello]

Nick Coghlan a écrit :
> 
> Implementing __with__ instead would give the CM complete control over
> whether or not to execute the block.
> 
please note, however, that this is an important change in the semantics of the 
with statement. As things are today, barring exceptional circunstances, the body 
of the with statement *will* be executed immediately. This allows to forget 
about the with statement when first reading code, as it doesn't change the 
intent of the programmer. What Glyph is proposing is more akin to Ruby code blocks.

cheers,
Baptiste