[IronPython] Simpy not working on IronPython because of type(generator) problem

J. Merrill jvm_cop at spamcop.net
Wed Dec 21 18:16:20 CET 2005

The new version of the Python Cookbook suggests using "isinstance" rather than direct comparison of types -- hopefully, the gentest() method "is a" generator.  So you'd use
    if not isinstance(process, types.GeneratorType):

I have not checked if that would work (in either current CPython or IronPython), and if it does that's what should be in simpy -- but isinstance wasn't added until 2.2 (I think) and simpy was probably built before that.

You might want to look at this (long) thread:


which (it seems to me) somewhat suggests using
    if not hasattr(process, '__iter__'):
in this case.

Good luck...

At 04:27 AM 12/21/2005, Stanislas Pinte wrote
>Internally we use a wonderful simulation framework written in python: http://simpy.sourceforge.net/
>I cannot make it work on python because it rests on generators...
>the main loop of simpy uses type(myFunction) == types.GeneratorType) to determine if it is a
>generator or not...
>> if not (type(process) == types.GeneratorType):
>>         raise Simerror("Fatal SimPy error: activating function which"+
>>                        " is not a generator (contains no 'yield')")
>However, in IronPython:
>>>> import types
>>>> def gentest():
>      for i in range(0,10):
>        yield i
>>>> print type(gentest)
><type '__main__+gentest0'>
>whereas in CPython it returns 
><type 'generator'>
>Any idea if we can fix this easely?

J. Merrill / Analytical Software Corp

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