Andre Roberge <[email protected]> added the comment:
Irit:
In all the books and tutorials I have seen, the advice is to try to catch
specific exceptions whenever possible or, *at most*, to catch Exception (and
not BaseException). This is to allow, for example, a program to be interrupted
by a KeyboardInterrupt.
As you know, the hierarchy is as follows:
BaseException
+-- SystemExit
+-- KeyboardInterrupt
+-- GeneratorExit
+-- Exception
+-- all others
If specific action to do some cleanup before a SystemExit (usually the result
of calling sys.exit()) or catching some KeyboardInterrupt (which is generally
NOT done via a raise statement), then these specific exception should be caught.
The documentation refers to GeneratorExit as not indicating an error needing to
be caught by users.
For this advice (catching Exception and not BaseException) to be correct, users
should be advised (as they are in the tutorial) to raise exceptions derived
from Exception (and not BaseException).
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