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argparse: work around bad default in py 3.7.0a/b/rc, fixes #3996

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This commit is contained in:
Thomas Waldmann 2018-07-30 01:02:25 +01:00
parent eb6481e8d3
commit 52f1cd4bc6
1 changed files with 7 additions and 1 deletions
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8
src/borg/testsuite/archiver.py
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@ -3669,7 +3669,13 @@ def basic_parser(self):
@pytest.fixture
def subparsers(self, basic_parser):
return basic_parser.add_subparsers(title='required arguments', metavar='<command>')
if sys.version_info >= (3, 7):
# py37 pre-release defaults to unwanted required=True, in 3.7.0+ it was fixed to =False
return basic_parser.add_subparsers(title='required arguments', metavar='<command>', required=False)
else:
# py36 does not support required=... argument (but behaves like required=False).
# note: use below call for 3.6 and 3.7 when there are no alphas/betas/RCs of 3.7.0 around any more.
return basic_parser.add_subparsers(title='required arguments', metavar='<command>')
@pytest.fixture
def parser(self, basic_parser):