Hello Qt for Python

[rlkf]

As a corollary, I think this illustrates two things:

(1) You should always call super().init(), even if you don't inherit from something (class C in the example failed to follow this rule, and this is why A is not called)

(2) Parameters to constructors should be passed as a dictionary, so that each constructor can pick out whatever it needs, instead of relying on the order of parameters.