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References¶

• Download this cheat sheet on http://encyclopython.com/pages/error-handling-cheat-sheet.html
• Python official doc tutorial on exceptions: https://docs.python.org/3/tutorial/errors.html
• Python official doc exception reference: https://docs.python.org/3/library/exceptions.html

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Handling¶

Typical case¶

Use¶

• ValueError when there is not obvious way of dealing with a value. E.G: trying to convert a sound into a color.
• TypeError when the value is of the wrong type. E.G: trying to get a color from a sound.
• RuntimeError when the configuration prevent your from going any further. E.G: an key resource is missing.
• NotImplementedError when part of the code is missing, either because you haven't coded it, can't code it or require the user to code it. E.G: a parent class delegate a method implementation to its children.
• TimeoutError when an operation is taking too much time. E.G: the serveur is not responding.
• LookupError when a search failed. E.G: trying to get a car from a wrong brand.

You can and should create your own exceptions¶

Intercepting exceptions then letting it crash¶

Reraise the original exception¶

Vidmore dvd monster. In a shell, the above exception does not reflect what will happen in a real program. This is what 'raise from' would give you if used in a module:

In a shell, the above exception does not reflect what will happen in a real program. This is what it would give you if used in a module:

Shorcuts for exceptions handling¶

In file handling¶

You can also control warnings by passing:

to either:

or:

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