How to avoid PEP8 'imported but unused'

[Fábio Santos]

That assert will never fail. If the symbol is not imported, the import
statement raises ImportError. And actually "assert" makes sure that
the value is not false-ish, not None/Null. And AFAIK a module object
is *always* true.

> One more question. In this particular case it seems 'assert' should be
> safe as a workaround, doesn't it?  'assert' will check if the symbol
> is imported and not NULL. Is there side effect if I just applied this
> rule as a generic one.
>

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Fábio Santos