The existing docs for errors and exceptions:- https://docs.python.org/3/tutorial/errors.html - https://github.com/python/cpython/blob/master/Doc/ tutorial/errors.rst
- https://www.tutorialspoint.com/python/python_exceptions. htm - If the docs don't answer the question (and match to the search terms), they probably should.- [ ] DOC: something about why "except Exception: pass" is usually bad- [ ] DOC: something about SystemExit and atexit: https://docs.python.org/2/library/atexit.html You can get alot more traceback from pytest (w/ pytest-sugar) and/or nose (with nose-progressive).There is extra information in the stack at exception time; but, IIUC, it would take a number of subclasses with class-specific docs and/or class introspection to be as detailed as "you probably wanted .append there because this is a List and the length is n but the key was".Maybe a "learning mode" which automatically calls inspect.getdoc() on Exception would be useful (sys.excepthook)?Practically, I usually just open an extra IPython shell and run `list.append?` for docs or `list.append??` for (Python but not C!) source (inspect.getsource).IPython also prints the function signature with `?`
The pdb++ debugger requires funcsigs in order to print function signatures. If pdb++ is installed, it preempts the standard pdb module; so `nosetests --pdb` and `pytest --pdb` launch pdb++ when an error or exception is raised.https://docs.python.org/2/library/inspect.html
Exceptions could be better someday. Testing (and debugging) skills are always good to learn; coincidentally, there are many great tools for it.... https://westurner.org/wiki/awesome-python-testing# debugging
On Tuesday, November 29, 2016, Victor Stinner <victor.stinner@gmail.com> wrote:Hi,
Python is optimized for performance. Formatting an error message has a
cost on performances.
I suggest you to teach your student to use the REPL and use a custom
exception handler: sys.excepthook:
https://docs.python.org/2/library/sys.html#sys.excepthook
Using a custom exception handler, you can run expensive functions,
like the feature: "suggest len when length is used".
The problem is then when students have to use a Python without the
custom exception handler.
Victor
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