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Improve namedtuple's _cast() method with a docstring, new name, and error-checking.

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This commit is contained in:
Raymond Hettinger 2008-01-05 01:35:43 +00:00
parent ced4eb06e4
commit 02740f73ff
3 changed files with 32 additions and 22 deletions
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11
Lib/test/test_collections.py
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@ -32,6 +32,9 @@ class TestNamedTuple(unittest.TestCase):
namedtuple('Point0', 'x1 y2') # Verify that numbers are allowed in names
namedtuple('_', 'a b c') # Test leading underscores in a typename
self.assertRaises(TypeError, Point._make, [11]) # catch too few args
self.assertRaises(TypeError, Point._make, [11, 22, 33]) # catch too many args
def test_instance(self):
Point = namedtuple('Point', 'x y')
p = Point(11, 22)
@ -47,7 +50,7 @@ class TestNamedTuple(unittest.TestCase):
self.assertEqual(repr(p), 'Point(x=11, y=22)')
self.assert_('__dict__' not in dir(p)) # verify instance has no dict
self.assert_('__weakref__' not in dir(p))
self.assertEqual(p, Point._cast([11, 22])) # test _cast classmethod
self.assertEqual(p, Point._make([11, 22])) # test _make classmethod
self.assertEqual(p._fields, ('x', 'y')) # test _fields attribute
self.assertEqual(p._replace(x=1), (1, 22)) # test _replace method
self.assertEqual(p._asdict(), dict(x=11, y=22)) # test _asdict method
@ -84,14 +87,14 @@ class TestNamedTuple(unittest.TestCase):
def test_odd_sizes(self):
Zero = namedtuple('Zero', '')
self.assertEqual(Zero(), ())
self.assertEqual(Zero._cast([]), ())
self.assertEqual(Zero._make([]), ())
self.assertEqual(repr(Zero()), 'Zero()')
self.assertEqual(Zero()._asdict(), {})
self.assertEqual(Zero()._fields, ())
Dot = namedtuple('Dot', 'd')
self.assertEqual(Dot(1), (1,))
self.assertEqual(Dot._cast([1]), (1,))
self.assertEqual(Dot._make([1]), (1,))
self.assertEqual(Dot(1).d, 1)
self.assertEqual(repr(Dot(1)), 'Dot(d=1)')
self.assertEqual(Dot(1)._asdict(), {'d':1})
@ -104,7 +107,7 @@ class TestNamedTuple(unittest.TestCase):
Big = namedtuple('Big', names)
b = Big(*range(n))
self.assertEqual(b, tuple(range(n)))
self.assertEqual(Big._cast(range(n)), tuple(range(n)))
self.assertEqual(Big._make(range(n)), tuple(range(n)))
for pos, name in enumerate(names):
self.assertEqual(getattr(b, name), pos)
repr(b) # make sure repr() doesn't blow-up