On 11.09.2021 15:17, Juancarlo Añez wrote: > Of course, none of this will make sense to programmers with a strong belief > that > assertions must always be turned off in production runs.
You seem to be missing that the Python optimize mode turns off all code which is related to debugging (__debug__ is set to False, the compiler doesn't generate code for "if __debug__: ..." statements). assert is just one of the instances where this happens: https://docs.python.org/3/reference/simple_stmts.html#grammar-token-assert-stmt asserts are meant to help find bugs in programs, not check for user input errors. They document assumptions a programmer has made when writing the code, which are then tested with a test suite to make sure the assumptions hold as invariants of the application. For anything which can go wrong at production run-time, please use normal if-statement checks and raise appropriate exceptions. Using assert in such cases is dangerous and can render your application broken, while everything appears to be running fine when testing. Unlike regular if-statement checks, asserts are meant to never trigger an exception in production code -- which is why they are removed with -O. This is not about whether or not to use -O in production environments, it's about preventing user input exceptions from going unnoticed when code is run with -O (e.g. the deployment team or a user decided to always use -O in production). -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Experts (#1, Sep 11 2021) >>> Python Projects, Coaching and Support ... https://www.egenix.com/ >>> Python Product Development ... https://consulting.egenix.com/ ________________________________________________________________________ ::: We implement business ideas - efficiently in both time and costs ::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 https://www.egenix.com/company/contact/ https://www.malemburg.com/ _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/CQZDKUPYTPM5A2X55E53SMHLURRSGRDH/ Code of Conduct: http://python.org/psf/codeofconduct/
