14.7. Terminating Execution
Clean execution occurs when a program runs to completion, where all statements in the top-level of your module finish execution and your program exits. There may be cases where you may want to exit from Python sooner, such as a fatal error of some sort. Another case is when conditions are not sufficient to continue execution.
In Python, there are varying ways to respond to errors. One is via exceptions and exception handling. Another way is to construct a “cleaner” approach so that the main portions of code are cordoned off with if statements to execute only in non-error situations, thus letting error scenarios terminate “normally.” However, you may also desire to exit to the calling program with an error code to ...
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