On Sep 19, 9:22 pm, MRAB <pyt...@mrabarnett.plus.com> wrote: > The point is that it's sometimes a good idea to do a cheap check first > before attempting an operation that's 'expensive' even when it fails.
Strongly agree. Furthermore, with LBYL it's often easier to give a user clearer error messages for common usage errors, rather than waiting for an exception in a much lower-level place where it's less clear to them what the cause is. -- http://mail.python.org/mailman/listinfo/python-list
