Feb 28, 2011 · Python’s assert statement is a debugging aid, not a mechanism for handling run-time errors. The goal of using assertions is to let developers find the likely root cause of a bug …

I share your annoyance that the python assert has unique syntax relative to all other python programming constructs, and this syntax has yet again changed from python2 to python3 and …

"assert" statements are removed when the compilation is optimized. So, yes, there are both performance and functional differences. The current code generator emits no code for an …

Assert isn't considered safe in production code; it's tempting to write assert x<5 and then be very surprised when x is more than 5 and the software continues running because Python was run …

Feb 5, 2021 · 108 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 …

Sep 5, 2012 · Note that Unicode strings which only contain ASCII will fail if checking types in this way, so you may want to do something like assert type(s) in (str, unicode) or assert …

Jul 21, 2012 · The traceback module and sys.exc_info are overkill for tracking down the source of an exception. That's all in the default traceback. So instead of calling exit (1) just re-raise: try: …

Sep 25, 2008 · On Python < 2.7 this construct is useful for checking for specific values in the expected exception. The unittest function assertRaises only checks if an exception was raised.

It works well for me both for Python 2.7 (if you install mock) and for Python 3.4. """ Demo using a mock to test logging output. """ import logging try: import unittest except ImportError: import …

When you use for item in o for some iterable object o, Python calls iter(o) and expects an iterator object as the return value. An iterator is any object which implements a __next__ (or next in …