python - Detecting Exception Type -

i have set of exceptions defined being raised depending on issue along custom message user.

i develop mechanism of error handling using these custom exceptions , let them bubble higher level logging class , user can provide feedback , tell them fix. end system crapping out, know come bit later.

however, if not 1 of manually created exceptions , system exception (these being raised, wrapped in custom exception), return general error.

when handling exception, way detect if 1 of mine or didn't account for?

i thinking of subclassing exceptions under base 1 custom attribute , checking when letting exception bubble up, seems kind of hacky.

thanks

you can derive exceptions single type. many major python libraries this.

now, see how derived b shared base class?

class a(exception):     pass  class b(a):     pass 

let's see if works:

>>> try: >>>     raise b >>> except a: >>>     print("caught") >>>      caught 

and doesn't catch unrelated exceptions?

>>> try: >>>     [][1] >>> except a: >>>     print("caught") >>>      indexerror: list index out of range 

wonderful.

inheritance friend: subclass single base exception define, , can try catch exception explicitly, log, , rethrow it. if isn't library, error not caught.