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bpo-40327: Improve atomicity, speed, and memory efficiency of the items() loop (GH-19628)
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@ -339,7 +339,7 @@ def whichmodule(obj, name):
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return module_name
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# Protect the iteration by using a list copy of sys.modules against dynamic
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# modules that trigger imports of other modules upon calls to getattr.
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for module_name, module in list(sys.modules.items()):
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for module_name, module in sys.modules.copy().items():
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if module_name == '__main__' or module is None:
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continue
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try:
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