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Diffstat (limited to 'Doc/library/collections.rst')
-rw-r--r-- | Doc/library/collections.rst | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index 0c440d6..6f2961a 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -510,7 +510,7 @@ field names, the method and attribute names start with an underscore. Point(x=33, y=22) >>> for partnum, record in inventory.items(): - inventory[partnum] = record._replace(price=newprices[partnum], timestamp=time.now()) + ... inventory[partnum] = record._replace(price=newprices[partnum], timestamp=time.now()) .. attribute:: somenamedtuple._fields @@ -525,7 +525,7 @@ field names, the method and attribute names start with an underscore. >>> Color = namedtuple('Color', 'red green blue') >>> Pixel = namedtuple('Pixel', Point._fields + Color._fields) >>> Pixel(11, 22, 128, 255, 0) - Pixel(x=11, y=22, red=128, green=255, blue=0)' + Pixel(x=11, y=22, red=128, green=255, blue=0) To retrieve a field whose name is stored in a string, use the :func:`getattr` function:: @@ -544,14 +544,14 @@ functionality with a subclass. Here is how to add a calculated field and a fixed-width print format:: >>> class Point(namedtuple('Point', 'x y')): - @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) + ... @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), Point(9./7,6): - print p + ... print p Point: x= 3.000 y= 4.000 hypot= 5.000 Point: x=14.000 y= 5.000 hypot=14.866 @@ -560,7 +560,7 @@ a fixed-width print format:: Another use for subclassing is to replace performance critcal methods with faster versions that bypass error-checking and that localize variable access:: - >>> class Point(namedtuple('Point', 'x y')): + class Point(namedtuple('Point', 'x y')): _make = classmethod(tuple.__new__) def _replace(self, _map=map, **kwds): return self._make(_map(kwds.get, ('x', 'y'), self)) |