["python","python-typing"]
Python type hints: typing.Mapping vs. typing.Dict

I'm working on a python3 project where we use the typing module type hints throughout. It seems that we use typing.Dict and typing.Mapping pretty much interchangeably. Is there a reason to prefer one over the other?
typing.Dict should be used to indicate a literal dict type with support for element type hinting i.e. Dict[bytes, str]. typing.Mapping is an object which defines the __getitem__, __len__, __iter__ magic methods. typing.MutableMapping is an object which defines same as Mapping but with __setitem__, __delitem__ magic methods as well. typing.Mapping et al. are based on the abc types in this table.