def getModificationTime(self):
        """
        Retrieve the time of last access from this file.

        @return: a number of seconds from the epoch.
        @rtype: L{float}
        """
        st = self._statinfo
        if not st:
            self.restat()
            st = self._statinfo
        return float(st.st_mtime)

        Retrieve the time of last access from this file.

        @return: a number of seconds from the epoch.
        @rtype: L{float}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/python/filepath.py