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S( s> Returns a new subclass of tuple with named fields.
>>> Point = namedtuple('Point', 'x y')
>>> Point.__doc__ # docstring for the new class
'Point(x, y)'
>>> p = Point(11, y=22) # instantiate with positional args or keywords
>>> p[0] + p[1] # indexable like a plain tuple
33
>>> x, y = p # unpack like a regular tuple
>>> x, y
(11, 22)
>>> p.x + p.y # fields also accessable by name
33
>>> d = p._asdict() # convert to a dictionary
>>> d['x']
11
>>> Point(**d) # convert from a dictionary
Point(x=11, y=22)
>>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
Point(x=100, y=22)
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| d j Vq Wd S( t _N( t isalnum( t .0t c( ( s! /usr/lib/python2.6/collections.pys <genexpr>+ s sW Type names and field names can only contain alphanumeric characters and underscores: %rs2 Type names and field names cannot be a keyword: %ri s9 Type names and field names cannot start with a number: %rR s/ Field names cannot start with an underscore: %rs$ Encountered duplicate field name: %rt 't i iÿÿÿÿs , c s s x | ] } d | Vq Wd S( s %s=%%rN( ( R
t name( ( s! /usr/lib/python2.6/collections.pys <genexpr>< s c s s) x" | ] \ } } d | | f Vq Wd S( s %r: t[%d]N( ( R
t posR ( ( s! /usr/lib/python2.6/collections.pys <genexpr>= s s¤ class %(typename)s(tuple):
'%(typename)s(%(argtxt)s)'
__slots__ = ()
_fields = %(field_names)r
def __new__(cls, %(argtxt)s):
return tuple.__new__(cls, (%(argtxt)s))
@classmethod
def _make(cls, iterable, new=tuple.__new__, len=len):
'Make a new %(typename)s object from a sequence or iterable'
result = new(cls, iterable)
if len(result) != %(numfields)d:
raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))
return result
def __repr__(self):
return '%(typename)s(%(reprtxt)s)' %% self
def _asdict(t):
'Return a new dict which maps field names to their values'
return {%(dicttxt)s}
def _replace(self, **kwds):
'Return a new %(typename)s object replacing specified fields with new values'
result = self._make(map(kwds.pop, %(field_names)r, self))
if kwds:
raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
return result
def __getnewargs__(self):
return tuple(self)
s& %s = property(itemgetter(%d))
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t yi s x yc B s& e Z d Z e d „ ƒ Z d „ Z RS( c C s | i d | i d d S( Ni g à?( R? R@ ( t self( ( s! /usr/lib/python2.6/collections.pyt hypot} s c C s d | i | i | i f S( Ns$ Point: x=%6.3f y=%6.3f hypot=%6.3f( R? R@ RB ( RA ( ( s! /usr/lib/python2.6/collections.pyt __str__€ s ( ( R R. t __slots__t propertyRB RC ( ( ( s! /usr/lib/python2.6/collections.pyR> { s i i i i g @c B s/ e Z d Z d Z e e i ƒ Z e d „ Z RS( sH Point class with optimized _make() and _replace() without error-checkingc K s | i | | i d | ƒ ƒ S( NR? R@ ( R? R@ ( t _makeR- ( RA t _mapt kwds( ( s! /usr/lib/python2.6/collections.pyt _replaceŠ s ( (
R R. t __doc__RD t classmethodR t __new__RF R RI ( ( ( s! /usr/lib/python2.6/collections.pyR> † s i i id t Point3Dt zt TestResultss failed attempted( RN ( t __all__t _abcollt _collectionsR R t operatorR R' t keywordR R t sysR+ t FalseR R t cPickleR< R= t TrueR> t pRI t _fieldsRM RJ t doctestRO t testmod( ( ( s! /usr/lib/python2.6/collections.pyt <module> s.
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