Issue #23016: A warning no longer produces AttributeError when the program
is run with pythonw.exe.
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@ -631,6 +631,15 @@ class _WarningsTests(BaseTest, unittest.TestCase):
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finally:
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globals_dict['__file__'] = oldfile
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def test_stderr_none(self):
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rc, stdout, stderr = assert_python_ok("-c",
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"import sys; sys.stderr = None; "
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"import warnings; warnings.simplefilter('always'); "
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"warnings.warn('Warning!')")
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self.assertEqual(stdout, b'')
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self.assertNotIn(b'Warning!', stderr)
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self.assertNotIn(b'Error', stderr)
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class WarningsDisplayTests(BaseTest):
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@ -11,6 +11,9 @@ def showwarning(message, category, filename, lineno, file=None, line=None):
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"""Hook to write a warning to a file; replace if you like."""
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if file is None:
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file = sys.stderr
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if file is None:
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# sys.stderr is None when ran with pythonw.exe - warnings get lost
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return
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try:
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file.write(formatwarning(message, category, filename, lineno, line))
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except OSError:
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@ -39,6 +39,9 @@ Core and Builtins
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Library
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-------
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- Issue #23016: A warning no longer produces an AttributeError when the program
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is run with pythonw.exe.
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- Issue #21775: shutil.copytree(): fix crash when copying to VFAT. An exception
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handler assumed that that OSError objects always have a 'winerror' attribute.
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That is not the case, so the exception handler itself raised AttributeError
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