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2013-04-18 11:18 pm (UTC)
[preemptive tl;dr reply after the first couple paragraphs]
Earlier today I learned another new and horrible thing about Python's complete and utter lack of namespace hygiene. Namely: because modules are just dictionaries, the current module is too, which means that modules are just dictionaries stored in a local variable. This in turn means that if you use a local variable of the same name as the module you imported, it can squash the module import. There appears to be some black magic to try to hide this fact, which only makes it worse since it means top-level local variables don't cause the problem, but local variables in function definitions do!
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