[Python-Dev] listcomps vs. for loops

[Delaney, Timothy C (Timothy)]

> From: Jp Calderone [mailto:exarkun at intarweb.us.avaya.com]
> 
>   Not when x is properly initialized.  Anyway, this is no 
> different from the
> problem of:
> 
>     for x in R:
>         ...
>     print x

For which reason I propose that Python 3.0 have the control name in any for expression be "local" to the expression ;)

Hmm - actually this does raise another issue.

    >>> x = 1
    >>> y = [1, 2, 3]
    >>> y = [x for x in y]

Using the current semantics:

    >>> print x
    3

Using the new semantics:

    >>> print x
    1

Is this a problem? Are the new semantics going to cause confusion?

Tim Delaney