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@ -479,7 +479,7 @@ field names, the method and attribute names start with an underscore.
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Point(x=33, y=22)
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>>> for partnum, record in inventory.items():
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inventory[partnum] = record._replace(price=newprices[partnum], timestamp=time.now())
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... inventory[partnum] = record._replace(price=newprices[partnum], timestamp=time.now())
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.. attribute:: somenamedtuple._fields
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@ -513,14 +513,14 @@ functionality with a subclass. Here is how to add a calculated field and
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a fixed-width print format::
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>>> class Point(namedtuple('Point', 'x y')):
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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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... @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), Point(9./7,6):
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print p
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... print p
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Point: x= 3.000 y= 4.000 hypot= 5.000
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Point: x=14.000 y= 5.000 hypot=14.866
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@ -529,7 +529,7 @@ a fixed-width print format::
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Another use for subclassing is to replace performance critcal methods with
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faster versions that bypass error-checking and that localize variable access::
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>>> class Point(namedtuple('Point', 'x y')):
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class Point(namedtuple('Point', 'x y')):
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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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