intentionality - complete
This rule raises an issue when a bare except:, an except BaseException or an except SystemExit block does not re-raise the exception caught.
A SystemExit exception is raised when sys.exit() is called. This exception is used to signal the interpreter to exit. The exception is expected to propagate up until the program stops. It is possible to catch this exception in order to perform, for example, clean-up tasks. It should, however, be raised again to allow the interpreter to exit as expected. Not re-raising such exception could lead to undesired behaviour.
A bare except: statement, i.e. an except block without any exception class, is equivalent to except BaseException. Both statements will catch every exceptions, including SystemExit. It is recommended to catch instead a more specific exception. If it is not possible, the exception should be raised again.
It is also a good idea to re-raise the KeyboardInterrupt exception. Similarly to SystemExit,KeyboardInterrupt is used to signal the interpreter to exit. Not re-raising such exception could also lead to undesired behaviour.
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