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39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
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################################################################################
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### Simple tests
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################################################################################
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# verify that instances can be pickled
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from collections import namedtuple
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from pickle import loads, dumps
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Point = namedtuple('Point', 'x, y', True)
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p = Point(x=10, y=20)
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assert p == loads(dumps(p))
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# test and demonstrate ability to override methods
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class Point(namedtuple('Point', 'x y')):
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__slots__ = ()
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@property
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def hypot(self):
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return (self.x ** 2 + self.y ** 2) ** 0.5
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def __str__(self):
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return 'Point: x=%6.3f y=%6.3f hypot=%6.3f' % (self.x, self.y, self.hypot)
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for p in Point(3, 4), Point(14, 5/7.):
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print (p)
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class Point(namedtuple('Point', 'x y')):
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'Point class with optimized _make() and _replace() without error-checking'
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__slots__ = ()
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_make = classmethod(tuple.__new__)
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def _replace(self, _map=map, **kwds):
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return self._make(_map(kwds.get, ('x', 'y'), self))
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print(Point(11, 22)._replace(x=100))
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Point3D = namedtuple('Point3D', Point._fields + ('z',))
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print(Point3D.__doc__)
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import doctest, collections
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TestResults = namedtuple('TestResults', 'failed attempted')
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print(TestResults(*doctest.testmod(collections)))
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