[issue3453] PyType_Ready doesn't ensure that all bases are ready

[Roger Upole]

Roger Upole <rupole at hotmail.com> added the comment:

If that were the case, it wouldn't need to call PyType_Ready for 
tp_base either.  From stepping thru the code, there are several places 
in the interpreter core that PyType_Ready is called for types whose 
tp_base has not been initialized yet.

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<http://bugs.python.org/issue3453>
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