On Thu, Mar 4, 2021 at 5:25 AM Barry Scott <ba...@barrys-emacs.org> wrote: > > > > > On 3 Mar 2021, at 17:35, David Lowry-Duda <da...@lowryduda.com> wrote: > > > >> assert condition, expression > >> > >> Only is condition is false with expression be evaluated. > >> So you can safely do expensive things I the expression with incuring > >> and cost if the condition is True. > > > > I think I've only every used a string as the expression. Have you found > > it useful to use complicated, expensive expressions? Could you give an > > example? > > In the test suite of the product I work on its common to put a lot of > information into the expression. > For example if a HTTP request returns unexpected content we will include all > the headers and > body of the that the request returners. > > assert http_status == '200', 'Request failed status %r Body:\n%s' % > (http_status, http_header_and_body) >
That doesn't look like the sort of thing that should be an assertion. Assertions should be for things that, if your code were bug-free, could never happen. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
