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The typing module was added to the standard library in Python 3.5 on a
provisional basis and will no longer be provisional in Python 3.7. However, this
means users of Python 3.5 - 3.6 who are unable to upgrade will not be able to
take advantage of new types added to the typing module, such as typing.Text or
typing.Coroutine.
The typing_extensions module contains both backports of these changes as well as
experimental types that will eventually be added to the typing module, such as
Protocol.
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