BaseException should not be caught

[alexrudd2]

Per the exception heirarchy, there are 3 Exceptions derived from Exception and not BaseException.

• KeyboardInterrupt
• SystemExit
• GeneratorExit

KeyboardInterrupt and SystemExit are typically not caught, as Python is closing anyways. I believe catching them interferes with e.g. CTRL+C.

GeneratorExit does not seem relevant here. Even if it were, it must be re-raised or RuntimeError: generator ignored GeneratorExit will occur.

I therefore propose changing all usages of except BaseException to except Exception.

This resolves a single error with pyright or mypy. However, it does technically represent a change from pyserial.