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 or TypedDict.
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 or TypedDict.
To install py38-typing_extensions, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install py38-typing_extensions
To see what files were installed by py38-typing_extensions, run:
port contents py38-typing_extensions
To later upgrade py38-typing_extensions, run:
sudo port selfupdate && sudo port upgrade py38-typing_extensions
Reporting an issue on MacPorts Trac
The MacPorts Project uses a system called Trac to file tickets to report bugs and enhancement requests.
Though anyone may search Trac for tickets, you must have a GitHub account in order to login to Trac to create tickets.