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bpo-40327: Improve atomicity speed and memory efficiency of the items() loop #19628

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Merged
rhettinger merged 1 commit into from
Apr 21, 2020
Merged

bpo-40327: Improve atomicity speed and memory efficiency of the items() loop #19628

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2 changes: 1 addition & 1 deletion Lib/pickle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -339,7 +339,7 @@ def whichmodule(obj, name):
return module_name
# Protect the iteration by using a list copy of sys.modules against dynamic
# modules that trigger imports of other modules upon calls to getattr.
for module_name, module in list(sys.modules.items()):
for module_name, module in sys.modules.copy().items():
if module_name == '__main__' or module is None:
continue
try:
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