[issue16259] Replace exec() in test.regrtest with __import__

[R. David Murray]

R. David Murray added the comment:

That's a safe use of exec, since the name is coming from a loaded module and not from user input.  Still, load_module would be cleaner.

However, the real fix is to just delete that code.  It is dead code...we always pass the indirect_test argument to dash_R.

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nosy: +r.david.murray

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<http://bugs.python.org/issue16259>
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