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The Ultimate Guide to Error Handling in Python
I often come across developers who know the mechanics of Python error handling well, yet when I review their code I find it to be far from good. Exceptions in Python is one of those areas that have a…
If the exception isn't caught and bubbles up all the way to the top, then Python will interrupt the application, and this is when you see a stack trace with all the levels through which the error traveled, a very useful debugging aid. Eventually the exceptions will reach a level at which the code knows how to do recovery, and at that point they will be considered type 2 errors, which are easily caught and handled. In addition, the Flask-SQLAlchemy extension attaches to the exception handling mechanism in Flask and rolls back the session for you when a database error occurs, the last important thing that we need.
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