[Python-Dev] Please Vote -- Generator Comprehensions

[Jack Jansen]

On woensdag, maart 6, 2002, at 07:23 , Raymond Hettinger wrote:
> Here is the proposal in a nutshell:
> =A0
> =A0=A0=A0 If a list comprehension starts with a 'yield' keyword, then
> =A0=A0=A0 express the comprehension with a generator.=A0 For example:
>
> =A0=A0=A0=A0=A0=A0=A0 g =3D [yield (len(line),line)=A0 for line in =
file=A0 if=20
> len(line)>5]
> =A0=A0=A0=A0=A0=A0=A0 print g.next()
>
> =A0=A0=A0 This would be implemented as if it had been written:
>
> =A0=A0=A0=A0=A0=A0=A0 def __tempGenComp(self):
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 for line in file:
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 if len(line) > 5:
> =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 yield =
(len(line), line)
> =A0=A0=A0=A0=A0=A0=A0 g =3D __tempGenComp()
> =A0=A0=A0=A0=A0=A0=A0 print g.next()

+1.

Now if you would please comment (or vote +1 or -1) on PEP 278 -=20
Allowing foreign newlines in text input files and modules=20
(universal newline support, for short) then that's another PEP=20
that could move forward. The code has been sitting there with=20
very minor mods for more than 4 months now:-(
--
- Jack Jansen        <Jack.Jansen@oratrix.com>       =20
http://www.cwi.nl/~jack -
- If I can't dance I don't want to be part of your revolution --=20
Emma Goldman -