bpo-34871: inspect: Don't pollute sys.modules (GH-9696)

https://bugs.python.org/issue34871

bpo-34871: inspect: Don't pollute sys.modules (GH-9696)
https://bugs.python.org/issue34871
6f85b826 · INADA Naoki · Miss Islington (bot) · c57eb9a3 · 6f85b826 · 6f85b826
Commit 6f85b826 authored Oct 05, 2018 by INADA Naoki Committed by Miss Islington (bot) Oct 04, 2018
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Lib/inspect.py Lib/inspect.py +1 -1

Misc/NEWS.d/next/Library/2018-10-04-18-46-54.bpo-34871.t3X-dB.rst ...S.d/next/Library/2018-10-04-18-46-54.bpo-34871.t3X-dB.rst +2 -0

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--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1988,7 +1988,7 @@ def _signature_fromstr(cls, obj, s, skip_bound_arg=True):
        module = sys.modules.get(module_name, None)
        if module:
            module_dict = module.__dict__
-    sys_module_dict = sys.modules
+    sys_module_dict = sys.modules.copy()

    def parse_name(node):
        assert isinstance(node, ast.arg)

--- a/Misc/NEWS.d/next/Library/2018-10-04-18-46-54.bpo-34871.t3X-dB.rst
+++ b/Misc/NEWS.d/next/Library/2018-10-04-18-46-54.bpo-34871.t3X-dB.rst
+Fix inspect module polluted ``sys.modules`` when parsing
+``__text_signature__`` of callable.