Nick Coghlan added the comment:

The scrapy case looks to just be the new metaclass constraint that's already 
covered in the "Porting to Python 3.6" guide: 
https://github.com/scrapy/scrapy/pull/2509/files

The ctypes case is more complicated, as its actually *reusing* the same class 
namespace to define two different classes, which is fundamentally incompatible 
with the way zero-argument super works.

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<http://bugs.python.org/issue29270>
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