Instead of `find -name '*.py' | grep -i "$PATTERN"` you can use `find -iname "*${PATTERN}*.py"` for case-insensitive glob-matched filenames, or mess around with

Instead of `find -name '*.py' | grep -i "$PATTERN"` you can use `find -iname "*${PATTERN}*.py"` for case-insensitive glob-matched filenames, or mess around with regexes on the whole path with `find -iregex "$REGEX"`. And yeah, why would you ASCII NUL terminate each filename output by `find` by using `-print0`? I mean, who adds quotes, backslashes or whitespace to their Python source file names?