That exception class is an attribute of the serial module, not of the Serial
object instance, "ser", that you have there.
So catch serial.SerialException.
I think you're importing and handling the exceptions fine. For importing, you
won't be able to access all the other stuff in the serial module if you just
import the Serial class. Also, polluting the global name space makes things
confusing for those reading your code ("where did this come from?" rather than,
"this is obviously from the serial module").
For the exception, there's no reason to catch all here. Catch what you expect
and leave the regular traceback for the rest.
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