Hi,
(I searched back and found some previous discussion on generator
attributes that seemed to be related to callable generators - this is
NOT that, as far as I can tell)
I want to associate some data with a generator. This is in a
decorator function, as it happens; the generator is being returned and
I want to add some info that is useful for debugging later. I have
tried modifying both .__doc__ and an arbitrary attribute, but the
first is read-only, and the second does not exist (ie you cant just
add one by writing to it; same error with setattr).
I realise I could create my own wrapper that implements __next__ (I am
using Python 3 and haven't checked the exact interface required, but I
guess it's something like that), and add the information that way, but
I am worried I am doing something too complicated. Is there really no
way to stick some arbitrary data onto a generator (from a function
that "yield"s)?
In case it's any help, the decorator is basically:
def mydecorator(f):
def decorate(self, *args):
generator = f(self, *args)
# none of these work
generator.__doc__ = 'From ' + str(self)
generator.description = 'From ' + str(self)
setattr(generator, 'description', 'From ' + str(self))
return generator
return decorate
and it's used like:
class ...
@mydeocrator
def foo(self, ...):
yield...
Thanks,
Andrew
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