STINNER Victor added the comment:
> ITSM it's not the TextIOWrapper but the detect_encoding fails and throws an
> error.
Oh, right. But TextIOWrapper can fail for differen reasons. For example, CTRL+c
may send KeyboardInterrupt.
Try for example:
with unittest.mock.patch.object(tokenize, '_builtin_open') as mock_open:
mock_file = mock_open.return_value
mock_file.tell.side_effect = OSError
mock_file.readline.return_value = b''
tokenize.open(fn)
This example raises an OSError in TextIOWrapper on file.tell(), and
file.close() is not called.
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23840>
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