can't import generators
Aahz
aahz at pythoncraft.com
Sat Jun 29 16:59:27 EDT 2002
In article <Xns923CE7C804E6Fcliechtigmxnet at 62.2.16.82>,
Chris Liechti <cliechti at gmx.net> wrote:
>aahz at pythoncraft.com (Aahz) wrote in news:afl5je$4iu$1 at panix1.panix.com:
>> In article <m2hejlc060.fsf at mother.paradise.lost>,
>> John Hunter <jdhunter at nitace.bsd.uchicago.edu> wrote:
>>>
>>>I am having trouble working with generators. Anyone know what might
>>>cause this behavior:
>>>
>>>Python 2.2.1 (#1, Apr 22 2002, 21:20:54) [GCC 3.0.4] on linux2
>>>Type "help", "copyright", "credits" or "license" for more information.
>>>>>> from __future__ import generators
>>>Traceback (most recent call last):
>>> File "<stdin>", line 1, in ?
>>>ImportError: cannot import name generators
>>
>> Can't do this in interactive mode. Use a script.
>
>?!?!? since when?
>
>$ python
>Python 2.2 (#28, Dec 21 2001, 12:21:22) [MSC 32 bit (Intel)] on win32
>Type "help", "copyright", "credits" or "license" for more information.
>>>> from __future__ import generators
>>>> def g(x):
>... for p in x: yield p
>...
>>>> [x for x in g(range(3))]
>[0, 1, 2]
Huh. That'll teach me to trust the combination of screen output and my
memory. Here's some more weird stuff. In a script, this works:
x=1
from __future__ import generators
this fails with SyntaxError:
x=1
print x
from __future__ import generators
but it works in interactive mode:
>>> x=1
>>> print x
1
>>> from __future__ import generators
Of course, none of this explains why John gets an ImportError, unless
he's got a completely screwed up installation.
--
Aahz (aahz at pythoncraft.com) <*> http://www.pythoncraft.com/
Project Vote Smart: http://www.vote-smart.org/
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