Issue #13896: Make shelf instances work with 'with' as context managers.
Original patch by Filip Gruszczyński.
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@ -131,6 +131,12 @@ class Shelf(collections.MutableMapping):
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except KeyError:
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pass
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def __enter__(self):
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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def close(self):
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self.sync()
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try:
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@ -147,6 +153,7 @@ class Shelf(collections.MutableMapping):
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def __del__(self):
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if not hasattr(self, 'writeback'):
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# __init__ didn't succeed, so don't bother closing
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# see http://bugs.python.org/issue1339007 for details
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return
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self.close()
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@ -148,6 +148,19 @@ class TestCase(unittest.TestCase):
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p2 = d[encodedkey]
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self.assertNotEqual(p1, p2) # Write creates new object in store
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def test_with(self):
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d1 = {}
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with shelve.Shelf(d1, protocol=2, writeback=False) as s:
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s['key1'] = [1,2,3,4]
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self.assertEqual(s['key1'], [1,2,3,4])
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self.assertEqual(len(s), 1)
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self.assertRaises(ValueError, len, s)
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try:
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s['key1']
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except ValueError:
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pass
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else:
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self.fail('Closed shelf should not find a key')
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from test import mapping_tests
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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 #13896: Make shelf instances work with 'with' as context managers.
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Original patch by Filip Gruszczyński.
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- Issue #15417: Add support for csh and fish in venv activation scripts.
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- Issue #16123: IDLE - deprecate running without a subprocess.
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