Distinguishing active generators from exhausted ones

[Michal Kwiatkowski]

Hi,

Is there a way to tell if a generator has been exhausted using pure
Python code? I've looked at CPython sources and it seems that
something like "active"/"exhausted" attribute on genobject is missing
from the API. For the time being I am using a simple C extension to
look at f_stacktop pointer of the generator frame, which seems to
differentiate active generators from exhausted ones. See
http://bazaar.launchpad.net/~ruby/pythoscope/support-python2.3/annotate/286/pythoscope/_util.c#L16
for complete source code.

I may be missing something obvious here. Is there a better way to tell
if a given generator object is still active or not?

Cheers,
mk