[issue13487] inspect.getmodule fails when module imports change sys.modules

[Patrik Simons]

Patrik Simons added the comment:

list(sys.modules.items()) still raises RuntimeError: dictionary changed size during iteration when another thread imports a module.

I would assume dict.copy() is thread-safe so a working fix could use sys.modules.copy().items()

I hit this bug when printing the name of the caller function using
inspect.stack(). The workaround in this case is calling inspect.stack(context=0).

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nosy: +psimons

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<http://bugs.python.org/issue13487>
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