Attempts to remove the `directories` from the set of blacklisted
        directories. If a particular directory is not found in the set of
        blacklisted, method will continue on silently.

        `directories` may be a single instance or an iterable. Recommend
        passing in absolute paths. Method will try to convert to an absolute
        path if it is not already using the current working directory.

def remove_blacklisted_directories(self, directories):
        """
        Attempts to remove the `directories` from the set of blacklisted
        directories. If a particular directory is not found in the set of
        blacklisted, method will continue on silently.

        `directories` may be a single instance or an iterable. Recommend
        passing in absolute paths. Method will try to convert to an absolute
        path if it is not already using the current working directory.
        """
        directories = util.to_absolute_paths(directories)
        black_dirs = self.blacklisted_directories
        black_dirs = util.remove_from_set(black_dirs, directories)