Python collections.MappingView() Examples

The following are 5 code examples of collections.MappingView(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module collections , or try the search function .
Example #1
Source File: test_dictviews.py    From ironpython2 with Apache License 2.0 6 votes vote down vote up 
def test_abc_registry(self):
        d = dict(a=1)

        self.assertIsInstance(d.viewkeys(), collections.KeysView)
        self.assertIsInstance(d.viewkeys(), collections.MappingView)
        self.assertIsInstance(d.viewkeys(), collections.Set)
        self.assertIsInstance(d.viewkeys(), collections.Sized)
        self.assertIsInstance(d.viewkeys(), collections.Iterable)
        self.assertIsInstance(d.viewkeys(), collections.Container)

        self.assertIsInstance(d.viewvalues(), collections.ValuesView)
        self.assertIsInstance(d.viewvalues(), collections.MappingView)
        self.assertIsInstance(d.viewvalues(), collections.Sized)

        self.assertIsInstance(d.viewitems(), collections.ItemsView)
        self.assertIsInstance(d.viewitems(), collections.MappingView)
        self.assertIsInstance(d.viewitems(), collections.Set)
        self.assertIsInstance(d.viewitems(), collections.Sized)
        self.assertIsInstance(d.viewitems(), collections.Iterable)
        self.assertIsInstance(d.viewitems(), collections.Container)
Example #2
Source File: utils.py    From mead-baseline with Apache License 2.0 5 votes vote down vote up 
def is_sequence(x) -> bool:
    if isinstance(x, str):
        return False
    return isinstance(x, (collections.Sequence, collections.MappingView))
Example #3
Source File: util.py    From law with BSD 3-Clause "New" or "Revised" License 5 votes vote down vote up 
def is_lazy_iterable(obj):
    """
    Returns whether *obj* is iterable lazily, such as generators, range objects, maps, etc.
    """
    iter_types = (
        types.GeneratorType, collections.MappingView, six.moves.range, six.moves.map, enumerate,
    )
    return isinstance(obj, iter_types)
Example #4
Source File: __init__.py    From twitter-stock-recommendation with MIT License 5 votes vote down vote up 
def sanitize_sequence(data):
    """Converts dictview object to list"""
    return list(data) if isinstance(data, collections.MappingView) else data
Example #5
Source File: __init__.py    From tree with Apache License 2.0 4 votes vote down vote up 
def _sequence_like(instance, args):
  """Converts the sequence `args` to the same type as `instance`.

  Args:
    instance: an instance of `tuple`, `list`, `namedtuple`, `dict`, or
        `collections.OrderedDict`.
    args: elements to be converted to the `instance` type.

  Returns:
    `args` with the type of `instance`.
  """
  if isinstance(instance, (dict, collections.Mapping)):
    # Pack dictionaries in a deterministic order by sorting the keys.
    # Notice this means that we ignore the original order of `OrderedDict`
    # instances. This is intentional, to avoid potential bugs caused by mixing
    # ordered and plain dicts (e.g., flattening a dict but using a
    # corresponding `OrderedDict` to pack it back).
    result = dict(zip(_sorted(instance), args))
    keys_and_values = ((key, result[key]) for key in instance)
    if isinstance(instance, collections.defaultdict):
      # `defaultdict` requires a default factory as the first argument.
      return type(instance)(instance.default_factory, keys_and_values)
    elif six.PY3 and isinstance(instance, types.MappingProxyType):
      # MappingProxyType requires a dict to proxy to.
      return type(instance)(dict(keys_and_values))
    else:
      return type(instance)(keys_and_values)
  elif isinstance(instance, collections.MappingView):
    # We can't directly construct mapping views, so we create a list instead
    return list(args)
  elif _is_namedtuple(instance) or _is_attrs(instance):
    if isinstance(instance, ObjectProxy):
      instance_type = type(instance.__wrapped__)
    else:
      instance_type = type(instance)
    return instance_type(*args)
  elif isinstance(instance, ObjectProxy):
    # For object proxies, first create the underlying type and then re-wrap it
    # in the proxy type.
    return type(instance)(_sequence_like(instance.__wrapped__, args))
  else:
    # Not a namedtuple
    return type(instance)(args)