Set the filename attributes. (They are multiple for personal
        reasons).

def _set_filename(self, fn):
        """Set the filename attributes. (They are multiple for personal
        reasons)."""
        try:
            self.filename = self.fs = self.fn = os.path.abspath(fn.name)
        except AttributeError:
            self.filename = self.fs = self.fn = os.path.abspath(fn)