Fix inspect.getmodule to use a copy of sys.modules for iteration (#13487).
This fixes a regression compared to 2.x, where sys.modules.items()
returns a copy, as indicated by a comment in the source. Diagnosis and
patch by Erik Tollerud.
diff --git a/Lib/inspect.py b/Lib/inspect.py
index bb46ea6..4e17f1b 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -483,7 +483,7 @@
return sys.modules.get(modulesbyfile[file])
# Update the filename to module name cache and check yet again
# Copy sys.modules in order to cope with changes while iterating
- for modname, module in sys.modules.items():
+ for modname, module in list(sys.modules.items()):
if ismodule(module) and hasattr(module, '__file__'):
f = module.__file__
if f == _filesbymodname.get(modname, None):