owners.py 文件源码

def _assert_is_collection(obj):
  assert not isinstance(obj, basestring)
  # Module 'collections' has no 'Iterable' member
  # pylint: disable=no-member
  if hasattr(collections, 'Iterable') and hasattr(collections, 'Sized'):
    assert (isinstance(obj, collections.Iterable) and
            isinstance(obj, collections.Sized))