Fnmath.filter works great. To remind people what it does, it takes an
iterable of strings and a pattern and returns a list of the strings that
match the pattern. And that is wonderful
However, I often need to filter *out* the items that match the pattern (to
ignore them). In every project that I need this I end up copying the
function out of the fnmatch library and adding 'not' to the test clause. It
would be wonderful if there was a filter_false version in the standard
library. Or in inversion Boolean option. Or something, to stop from having
to copy code every time I need to ignore files.