[Python-Dev] An issue recently brought up in patch#872326(generator expression)

[Samuele Pedroni]

At 12:54 23.03.2004 -0800, Guido van Rossum wrote:
> > > All this makes me lean towards getting rid of the binding capture
> > > feature.  That way everybody will get bitten by the late binding fair
> > > and square the first time they try it.
> >
> > I prefer this approach over one that has subtleties and nuances.
>
>I was partly inpsired to this position by reading a draft for Paul
>Graham's new book, Hackers and Painters (which will include last
>year's PyCon keynote on the 100-year language).  In one of his many
>criticisms of Common Lisp (not his favorite Lisp dialect :), Paul
>complains about hygienic macros that they are designed to take away
>the power and sharp edges, but that for him the attraction of Lisp is
>precisely in that power.

hmm, I'm confused CL has non-hygienic macros, although you can workaround that
using the package system or gensym,
  Scheme has hygienic macros,

the current list comprehension in Python e.g. behaves like an unhygienic macro:

x = 3
l= [ l*2 for x in l]
# x is not 3 anymore.