Problems with Python 3.12

[sneakyx]

Hello, thanks for the good package. With Python 3.11 it works like a charm, but with Python 3.12 we get the error
TypeError: constraints must be a tuple

Even when we only add the simple example from the docs in our code.
Traceback (most recent call last):

  File "/usr/local/bin/uvicorn", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/uvicorn/main.py", line 404, in main
    run(
  File "/usr/local/lib/python3.12/site-packages/uvicorn/main.py", line 569, in run
    server.run()
  File "/usr/local/lib/python3.12/site-packages/uvicorn/server.py", line 60, in run
    return asyncio.run(self.serve(sockets=sockets))
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/runners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/asyncio/base_events.py", line 664, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/uvicorn/server.py", line 67, in serve
    config.load()
  File "/usr/local/lib/python3.12/site-packages/uvicorn/config.py", line 477, in load
    self.loaded_app = import_from_string(self.app)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/uvicorn/importer.py", line 21, in import_from_string
    module = importlib.import_module(module_str)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1381, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1354, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1325, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 929, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 994, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/src/app/main.py", line 10, in <module>
    from core import eventing
  File "/usr/src/app/core/eventing.py", line 1, in <module>
    from pyee.base import EventEmitter
  File "/usr/local/lib/python3.12/site-packages/pyee/__init__.py", line 32, in <module>
    from pyee.base import EventEmitter as EventEmitter
  File "/usr/local/lib/python3.12/site-packages/pyee/base.py", line 23, in <module>
    Handler = TypeVar(name="Handler", bound=Callable)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: constraints must be a tuple

[jfhbrook]

At a glance it looks like 3.12 made the API for the bound argument to TypeVar more strict. I won't be able to look for at least a week, but can review/accept a PR in the meantime.

[mxschmitt]

Thank you for the release @jfhbrook!