This is the syntax in Python 2 - note this is not compatible with Python 3: raise AppError, error, sys.exc ...

If you are catching an exception in an except ...: handler, the traceback will include the whole stack, from the point where your Python program started up to the place where the exception was raised. So it doesn't matter where in the stack your handler is located, really. If you need to re-raise the exception after handling, use raise, nothing ...

The difference is that when you use from, the __cause__ attribute is set and the message states that the exception was directly caused by.

Mar 18, 2016 · I use a third-party library that's fine but does not handle inexistant files the way I would like. When giving it a non-existant file, instead of raising the good old FileNotFoundError: [Errno 2]...

Feb 6, 2012 · This only works with Python 3.You can modify the exception's original arguments and add your own arguments. An exception remembers the args it was created with.

Sep 25, 2013 · As per strictest interpretation of the question "continue even if there's an exception". Python gives us a keyword "finally" which executes a block of code no matter what precedes it. The only issue with this method will run a block of code regardless of the type of error, which might not be desirable for all cases.

Note that this does not exactly do what you asked (status != 200): It will not raise an exception for 201 Created or 204 No Content, or any of the 3xx redirects - but this is most likely the behavior you want: requests will just follow the redirects, and the other 2xx are usually just fine if you're dealing with an API.

Aug 12, 2013 · @TobiasKienzler raise t, None, tb will lose the value of the exception and will force raise to re-instantiate it from the type, giving you a less specific (or simply incorrect) exception value. For example, if the raised exception is KeyError("some-key"), it will just re-raise KeyError() and omit the exact missing key from the traceback.

Feb 5, 2021 · I have been learning Python for a while and the raise function and assert are (what I realised is that both of them crash the app, unlike try - except) really similar and I can't see a situation where you would use raise or assert over try. …

Dec 9, 2010 · @John Machin: Don't think I can be held accountable for not honoring requests in comments of deleted answers I didn't and can't see.