[Python-3000] Change to class construction?

[Georg Brandl]

Greg Ewing schrieb:
> Phillip J. Eby wrote:
>> This looks like a bug to me.  A list comprehension's local scope 
>> should be the locals of the enclosing code, even if its loop indexes 
>> aren't exposed to that scope.
> 
> It sounds like list comprehensions are being implemented
> using genexps behind the scenes now.

That's not true, but the implementation is somewhat similar in that
the code is executed in its own function context.

> Is this wise? In a recent thread, I suggested that one
> of the reasons for keeping the LC syntax was that it
> could be faster than list(genexp). Has anyone investigated
> whether any speed is being lost by making them equivalent?

I don't remember the details, but IIRC the new LC implementation
was not slower than the 2.x one. Nick should know more about that.

Georg

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