[Baypiggies] introspecting for generator vs non-generator function

Matt Good matt at matt-good.net
Sat Nov 15 20:01:55 CET 2008

On Nov 14, 2008, at 9:23 PM, wesley chun wrote:

> On Fri, Nov 14, 2008 at 8:04 PM, Alex Martelli <aleaxit at gmail.com>  
> wrote:
>> On Fri, Nov 14, 2008 at 7:44 PM, Matt Good <matt at matt-good.net>  
>> wrote:
>>> There's a co_flags for that:
>>> "The following flag bits are defined for co_flags: ... bit 0x20 is  
>>> set if
>>> the function is a generator."
>>> So:
>>> def is_generator(func):
>>> return bool(func.func_code.co_flags & 0x20)
>> Yes it was -- I just approved it.  Thanks!  If there's one thing that
>> makes me even happier than teaching, it's learning!-)
> i have to agree with alex... that was a great find matt!  for those
> interested in exploring further where he found it, it's in the 2.5.2
> docs:

Thanks.  I'll admit that I didn't know that one off the top of my  
head, so I just did a quick dump of attributes that differed between  
the two:

for k in dir(f.func_code):
   if getattr(f.func_code, k, None) != getattr(g.func_code, k, None):
     print k

When I saw co_flags I remembered the bit about the generator flag from  
looking into the varargs flags not too long ago.

HTH someone else digging into these esoteric bits of the language :)

-- Matt

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