Python OrderedDict.keys方法代码示例

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __getitem__(self, key):
        """
        Allows slicing. Returns an OrderedDict if you slice.
        >>> b = OrderedDict([(7, 0), (6, 1), (5, 2), (4, 3), (3, 4), (2, 5), (1, 6)])
        >>> b[::-1]
        OrderedDict([(1, 6), (2, 5), (3, 4), (4, 3), (5, 2), (6, 1), (7, 0)])
        >>> b[2:5]
        OrderedDict([(5, 2), (4, 3), (3, 4)])
        >>> type(b[2:4])
        <class '__main__.OrderedDict'>
        """
        if isinstance(key, types.SliceType):
            # FIXME: does this raise the error we want?
            keys = self._sequence[key]
            # FIXME: efficiency?
            return OrderedDict([(entry, self[entry]) for entry in keys])
        else:
            return dict.__getitem__(self, key) 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __getattr__(self, name):
        """
        Implemented so that access to ``sequence`` raises a warning.

        >>> d = OrderedDict()
        >>> d.sequence
        []
        """
        if name == 'sequence':
            warnings.warn('Use of the sequence attribute is deprecated.'
                ' Use the keys method instead.', DeprecationWarning)
            # NOTE: Still (currently) returns a direct reference. Need to
            #   because code that uses sequence will expect to be able to
            #   mutate it in place.
            return self._sequence
        else:
            # raise the appropriate error
            raise AttributeError("OrderedDict has no '%s' attribute" % name) 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def iteritems(self):
        """
        >>> ii = OrderedDict(((1, 3), (3, 2), (2, 1))).iteritems()
        >>> ii.next()
        (1, 3)
        >>> ii.next()
        (3, 2)
        >>> ii.next()
        (2, 1)
        >>> ii.next()
        Traceback (most recent call last):
        StopIteration
        """
        def make_iter(self=self):
            keys = self.iterkeys()
            while True:
                key = keys.next()
                yield (key, self[key])
        return make_iter() 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def itervalues(self):
        """
        >>> iv = OrderedDict(((1, 3), (3, 2), (2, 1))).itervalues()
        >>> iv.next()
        3
        >>> iv.next()
        2
        >>> iv.next()
        1
        >>> iv.next()
        Traceback (most recent call last):
        StopIteration
        """
        def make_iter(self=self):
            keys = self.iterkeys()
            while True:
                yield self[keys.next()]
        return make_iter()

### Read-write methods ### 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __setitem__(self, index, value):
        """
        Set the value at position i to value.

        You can only do slice assignment to values if you supply a sequence of
        equal length to the slice you are replacing.
        """
        if isinstance(index, types.SliceType):
            keys = self._main._sequence[index]
            if len(keys) != len(value):
                raise ValueError('attempt to assign sequence of size %s '
                    'to slice of size %s' % (len(name), len(keys)))
            # FIXME: efficiency?  Would be better to calculate the indexes
            #   directly from the slice object
            # NOTE: the new keys can collide with existing keys (or even
            #   contain duplicates) - these will overwrite
            for key, val in zip(keys, value):
                self._main[key] = val
        else:
            self._main[self._main._sequence[index]] = value

    ### following methods pinched from UserList and adapted ### 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __init__(self, init_val=(), strict=False):
        """
        Create a new ordered dictionary. Cannot init from a normal dict,
        nor from kwargs, since items order is undefined in those cases.

        If the ``strict`` keyword argument is ``True`` (``False`` is the
        default) then when doing slice assignment - the ``OrderedDict`` you are
        assigning from *must not* contain any keys in the remaining dict.

        >>> OrderedDict()
        OrderedDict([])
        >>> OrderedDict({1: 1})
        Traceback (most recent call last):
        TypeError: undefined order, cannot get items from dict
        >>> OrderedDict({1: 1}.items())
        OrderedDict([(1, 1)])
        >>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> d
        OrderedDict([(1, 3), (3, 2), (2, 1)])
        >>> OrderedDict(d)
        OrderedDict([(1, 3), (3, 2), (2, 1)])
        """
        self.strict = strict
        dict.__init__(self)
        if isinstance(init_val, OrderedDict):
            self._sequence = init_val.keys()
            dict.update(self, init_val)
        elif isinstance(init_val, dict):
            # we lose compatibility with other ordered dict types this way
            raise TypeError('undefined order, cannot get items from dict')
        else:
            self._sequence = []
            self.update(init_val)

### Special methods ### 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __delitem__(self, key):
        """
        >>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> del d[3]
        >>> d
        OrderedDict([(1, 3), (2, 1)])
        >>> del d[3]
        Traceback (most recent call last):
        KeyError: 3
        >>> d[3] = 2
        >>> d
        OrderedDict([(1, 3), (2, 1), (3, 2)])
        >>> del d[0:1]
        >>> d
        OrderedDict([(2, 1), (3, 2)])
        """
        if isinstance(key, types.SliceType):
            # FIXME: efficiency?
            keys = self._sequence[key]
            for entry in keys:
                dict.__delitem__(self, entry)
            del self._sequence[key]
        else:
            # do the dict.__delitem__ *first* as it raises
            # the more appropriate error
            dict.__delitem__(self, key)
            self._sequence.remove(key) 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __setattr__(self, name, value):
        """
        Implemented so that accesses to ``sequence`` raise a warning and are
        diverted to the new ``setkeys`` method.
        """
        if name == 'sequence':
            warnings.warn('Use of the sequence attribute is deprecated.'
                ' Use the keys method instead.', DeprecationWarning)
            # NOTE: doesn't return anything
            self.setkeys(value)
        else:
            # FIXME: do we want to allow arbitrary setting of attributes?
            #   Or do we want to manage it?
            object.__setattr__(self, name, value) 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def setkeys(self, keys):
        """
        ``setkeys`` all ows you to pass in a new list of keys which will
        replace the current set. This must contain the same set of keys, but
        need not be in the same order.

        If you pass in new keys that don't match, a ``KeyError`` will be
        raised.

        >>> d = OrderedDict(((1, 3), (3, 2), (2, 1)))
        >>> d.keys()
        [1, 3, 2]
        >>> d.setkeys((1, 2, 3))
        >>> d
        OrderedDict([(1, 3), (2, 1), (3, 2)])
        >>> d.setkeys(['a', 'b', 'c'])
        Traceback (most recent call last):
        KeyError: 'Keylist is not the same as current keylist.'
        """
        # FIXME: Efficiency? (use set for Python 2.4 :-)
        # NOTE: list(keys) rather than keys[:] because keys[:] returns
        #   a tuple, if keys is a tuple.
        kcopy = list(keys)
        kcopy.sort()
        self._sequence.sort()
        if kcopy != self._sequence:
            raise KeyError('Keylist is not the same as current keylist.')
        # NOTE: This makes the _sequence attribute a new object, instead
        #       of changing it in place.
        # FIXME: efficiency?
        self._sequence = list(keys) 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __call__(self):
        """Pretend to be the keys method."""
        return self._main._keys() 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __iadd__(self, other): raise TypeError('Can\'t add in place to keys') 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def __imul__(self, n): raise TypeError('Can\'t multiply keys in place') 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def append(self, item): raise TypeError('Can\'t append items to keys') 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def insert(self, i, item): raise TypeError('Can\'t insert items into keys') 

# 需要导入模块: from collections import OrderedDict [as 别名]
# 或者: from collections.OrderedDict import keys [as 别名]
def remove(self, item): raise TypeError('Can\'t remove items from keys')