[PyQt] Patch to fix undefined names in examples

[Dmitry Shachnev]

Hi,

Attached a patch that fixes all pyflakes errors about undefined names
in examples (mostly typos or missing imports). Please consider
applying it.

There are still pyflakes warnings about unused imports/variables/etc,
I didn't fix those as they are not critical.

--
Dmitry Shachnev
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