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Python Compiled Bytecode | 2009-11-11 | 7KB | 134 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.6)

__all__ = [
    'deque',
    'defaultdict',
    'namedtuple']
from _abcoll import *
import _abcoll
__all__ += _abcoll.__all__
from _collections import deque, defaultdict
from operator import itemgetter as _itemgetter
from keyword import iskeyword as _iskeyword
import sys as _sys

def namedtuple(typename, field_names, verbose = False):
    """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)

    """
    if isinstance(field_names, basestring):
        field_names = field_names.replace(',', ' ').split()

    field_names = tuple(map(str, field_names))
    for name in (typename,) + field_names:
        if not all((lambda .0: for c in .0:
if not c.isalnum():
passc == '_')(name)):
            raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
        all((lambda .0: for c in .0:
if not c.isalnum():
passc == '_')(name))
        if _iskeyword(name):
            raise ValueError('Type names and field names cannot be a keyword: %r' % name)
        _iskeyword(name)
        if name[0].isdigit():
            raise ValueError('Type names and field names cannot start with a number: %r' % name)
        name[0].isdigit()

    seen_names = set()
    for name in field_names:
        if name.startswith('_'):
            raise ValueError('Field names cannot start with an underscore: %r' % name)
        name.startswith('_')
        if name in seen_names:
            raise ValueError('Encountered duplicate field name: %r' % name)
        name in seen_names
        seen_names.add(name)

    numfields = len(field_names)
    argtxt = repr(field_names).replace("'", '')[1:-1]
    reprtxt = ', '.join((lambda .0: for name in .0:
'%s=%%r' % name)(field_names))
    dicttxt = ', '.join((lambda .0: for pos, name in .0:
'%r: t[%d]' % (name, pos))(enumerate(field_names)))
    template = "class %(typename)s(tuple):\n        '%(typename)s(%(argtxt)s)' \n\n        __slots__ = () \n\n        _fields = %(field_names)r \n\n        def __new__(_cls, %(argtxt)s):\n            return _tuple.__new__(_cls, (%(argtxt)s)) \n\n        @classmethod\n        def _make(cls, iterable, new=tuple.__new__, len=len):\n            'Make a new %(typename)s object from a sequence or iterable'\n            result = new(cls, iterable)\n            if len(result) != %(numfields)d:\n                raise TypeError('Expected %(numfields)d arguments, got %%d' %% len(result))\n            return result \n\n        def __repr__(self):\n            return '%(typename)s(%(reprtxt)s)' %% self \n\n        def _asdict(t):\n            'Return a new dict which maps field names to their values'\n            return {%(dicttxt)s} \n\n        def _replace(_self, **kwds):\n            'Return a new %(typename)s object replacing specified fields with new values'\n            result = _self._make(map(kwds.pop, %(field_names)r, _self))\n            if kwds:\n                raise ValueError('Got unexpected field names: %%r' %% kwds.keys())\n            return result \n\n        def __getnewargs__(self):\n            return tuple(self) \n\n" % locals()
    for i, name in enumerate(field_names):
        template += '        %s = _property(_itemgetter(%d))\n' % (name, i)

    if verbose:
        print template

    namespace = dict(_itemgetter = _itemgetter, __name__ = 'namedtuple_%s' % typename, _property = property, _tuple = tuple)

    try:
        exec template in namespace
    except SyntaxError:
        e = None
        raise SyntaxError(e.message + ':\n' + template)

    result = namespace[typename]
    if hasattr(_sys, '_getframe'):
        result.__module__ = _sys._getframe(1).f_globals.get('__name__', '__main__')

    return result

if __name__ == '__main__':
    from cPickle import loads, dumps
    Point = namedtuple('Point', 'x, y', True)
    p = Point(x = 10, y = 20)
    if not p == loads(dumps(p)):
        raise AssertionError

    class Point(namedtuple('Point', 'x y')):
        __slots__ = ()

        def hypot(self):
            return (self.x ** 2 + self.y ** 2) ** 0.5

        hypot = property(hypot)

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