10.11. Why Exceptions at All?
If the above section was not motivation enough, imagine what Python programming might be like without program-level exception handling. The first thing that comes to mind is the loss of control client programmers have over their code. For example, if you created an interactive application which allocates and utilizes a large number of resources, if a user hit ^C or other keyboard interrupt, the application would not have the opportunity to perform clean-up, resulting in perhaps loss of data, or data corruption. There is also no mechanism to take alternative action such as prompting the users to confirm whether they really want to quit or if they hit the control key accidentally.
Another drawback would be that functions ...
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