Leveraging the exception matching rules

The try statement lets us capture an exception. When an exception is raised, we have a number of choices for handling it:

• Ignore it: If we do nothing, the program stops. We can do this in two ways—don't use a try statement in the first place, or don't have a matching except clause in the try statement.

• Log it: We can write a message and let it propagate; generally this will stop the program.

• Recover from it: We can write an except clause to do some recovery action to undo the effects of something that was only partially completed in the try clause. We can take this a step further and wrap the try statement in a while statement and keep retrying until it succeeds.

• Silence it: If we do nothing (that is, pass) then processing is resumed after the try statement. This silences the exception.

• Rewrite it: We can raise a different exception. The original exception becomes a context for the newly-raised exception.

• Chain it: We chain a different exception to the original...