TypeError: class must have base classes

[alanjds]

google#341 opened by @m4ns0ur on Jul 1, 2017

any transcompiled simple (empty) python class, raising same error:

TypeError: class must have base classes

to reproduce the issue, create a python file with below code, then transcompile, and run:

class c:
    pass

it is happening because of a sanity check here, anyway it needs more investigation to see why base class is empty there.

[alanjds]

Comment by m4ns0ur
Tuesday Jul 04, 2017 at 23:39 GMT

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@trotterdylan any comment on this?

[alanjds]

Comment by trotterdylan
Wednesday Jul 05, 2017 at 04:44 GMT

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Classes without a list of bases are old style classes, and Grumpy doesn't current support them. I've debated whether to bother supporting old style classes since Python 3 gets rid of them.

Unfortunately there are subtle behavioral differences between new and old style classes so we can't just pretend to support them by replacing the empty list of bases with (object).

For modules that use old style classes, I've just been modifying the code to add the object base class and hoping that they continue to work correctly.

[alanjds]

Comment by m4ns0ur
Wednesday Jul 05, 2017 at 07:27 GMT

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@trotterdylan thanks! I'll try to do same for the modules.