On Apr 9, 2012, at 9:50 PM, Andrew Bennetts wrote: > On Tue, Apr 10, 2012 at 12:41:17PM +0800, gelin yan wrote: > […] >> When trying to run inlineCallbacks with Cython, a TypeError would come >> out like: >> >> TypeError: inlineCallbacks requires <built-in function test> to produce a >> generator; instead got <cy3.__pyx_scope_struct__test object at 0x02808848) >> >> test is the function where inlineCallbacks uses. >> >> It looks like cython changes the name test to cy3.__pyx_scope_struct__test >> internally so generator can't work properly. > > inlineCallbacks doesn't care what the function name is. The problem here is > that inlineCallbacks expects to be passed a generator function[1], and instead > it is being passed some other sort of object. The ugly cy3.__blah name is a > red > herring. > > -Andrew. > > [1] Without the check that produces this error, a common and very confusing > error is to decorate a non-generator function (i.e. one with no yield > statement) with @inlineCallbacks, which would appear to work but would then > mysteriously fail to do anything useful when executed.
Aah, I see. So Twisted's check is a bit overzealous in the context of Cython. Could you perhaps wrap the Cython pseudo-generator in a function that converts it into something like a real Python generator, or disable the warning and see if it works as expected? PEP 380 <http://www.python.org/dev/peps/pep-0380/> does have some code which one might use to do general-purpose iterator-to-generator conversion. In any case, please file a bug. Search the tracker for duplicates first, of course, but there don't appear to be any. There is some precedent for fixing this type of error, too: <http://twistedmatrix.com/trac/ticket/3132> was somewhat similar. -glyph _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
