bpo-39942:Fix failure in `TypeVar` when missing `__name__` (GH-19616)
https://bugs.python.org/issue39942
(cherry picked from commit a25a04fea5446b1712cde0cff556574be139285a)
Co-authored-by: HongWeipeng <hongweichen8888@sina.com>
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index ded5a8b..bdd7acd 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -220,6 +220,13 @@
with self.assertRaises(TypeError):
TypeVar('X', str, float, bound=Employee)
+ def test_missing__name__(self):
+ # See bpo-39942
+ code = ("import typing\n"
+ "T = typing.TypeVar('T')\n"
+ )
+ exec(code, {})
+
def test_no_bivariant(self):
with self.assertRaises(ValueError):
TypeVar('T', covariant=True, contravariant=True)
diff --git a/Lib/typing.py b/Lib/typing.py
index 7aab8db..f4fb08f 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -600,7 +600,10 @@
self.__bound__ = _type_check(bound, "Bound must be a type.")
else:
self.__bound__ = None
- def_mod = sys._getframe(1).f_globals['__name__'] # for pickling
+ try:
+ def_mod = sys._getframe(1).f_globals.get('__name__', '__main__') # for pickling
+ except (AttributeError, ValueError):
+ def_mod = None
if def_mod != 'typing':
self.__module__ = def_mod
diff --git a/Misc/NEWS.d/next/Library/2020-04-20-20-16-02.bpo-39942.NvGnTc.rst b/Misc/NEWS.d/next/Library/2020-04-20-20-16-02.bpo-39942.NvGnTc.rst
new file mode 100644
index 0000000..3b83037
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-04-20-20-16-02.bpo-39942.NvGnTc.rst
@@ -0,0 +1,2 @@
+Set "__main__" as the default module name when "__name__" is missing in
+:class:`typing.TypeVar`. Patch by Weipeng Hong.