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

Samuele Pedroni pedronis at bluewin.ch
Tue Mar 23 16:15:27 EST 2004

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.

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