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Edit File : __main__.py \| Size : 1.25 KB
################################################################################ ### Simple tests ################################################################################ # verify that instances can be pickled from collections import namedtuple from pickle import loads, dumps Point = namedtuple('Point', 'x, y', True) p = Point(x=10, y=20) assert p == loads(dumps(p)) # test and demonstrate ability to override methods class Point(namedtuple('Point', 'x y')): __slots__ = () @property def hypot(self): return (self.x 2 + self.y 2) 0.5 def __str__(self): return 'Point: x=%6.3f y=%6.3f hypot=%6.3f' % (self.x, self.y, self.hypot) for p in Point(3, 4), Point(14, 5/7.): print (p) class Point(namedtuple('Point', 'x y')): 'Point class with optimized _make() and _replace() without error-checking' __slots__ = () _make = classmethod(tuple.__new__) def _replace(self, _map=map, kwds): return self._make(_map(kwds.get, ('x', 'y'), self)) print(Point(11, 22)._replace(x=100)) Point3D = namedtuple('Point3D', Point._fields + ('z',)) print(Point3D.__doc__) import doctest, collections TestResults = namedtuple('TestResults', 'failed attempted') print(TestResults(*doctest.testmod(collections))) Back

Edit File : __main__.py | Size : 1.25 KB

################################################################################
### Simple tests
################################################################################

# verify that instances can be pickled
from collections import namedtuple
from pickle import loads, dumps
Point = namedtuple('Point', 'x, y', True)
p = Point(x=10, y=20)
assert p == loads(dumps(p))

# test and demonstrate ability to override methods
class Point(namedtuple('Point', 'x y')):
    __slots__ = ()
    @property
    def hypot(self):
        return (self.x ** 2 + self.y ** 2) ** 0.5
    def __str__(self):
        return 'Point: x=%6.3f  y=%6.3f  hypot=%6.3f' % (self.x, self.y, self.hypot)

for p in Point(3, 4), Point(14, 5/7.):
    print (p)

class Point(namedtuple('Point', 'x y')):
    'Point class with optimized _make() and _replace() without error-checking'
    __slots__ = ()
    _make = classmethod(tuple.__new__)
    def _replace(self, _map=map, **kwds):
        return self._make(_map(kwds.get, ('x', 'y'), self))

print(Point(11, 22)._replace(x=100))

Point3D = namedtuple('Point3D', Point._fields + ('z',))
print(Point3D.__doc__)

import doctest, collections
TestResults = namedtuple('TestResults', 'failed attempted')
print(TestResults(*doctest.testmod(collections)))

Back