code: def __delete(self, key):
          ''' Delete file key from database
          '''
          with self.get_conn() as conn:
              try:
                  c = conn.cursor()
                  c.execute("DELETE FROM cache_entries WHERE key = ?", (key,))
                  conn.commit()
              except:
                  getLogger().exception("Cannot delete")
                  return Nonf __delete(self, key):
          ''' Delete file key from database
          '''
          with self.get_conn() as conn:
              try:
                  c = conn.cursor()
                  c.execute("DELETE FROM cache_entries WHERE key = ?", (key,))
                  conn.commit()
              except:
                  getLogger().exception("Cannot delete")
                  return None
docs: Delete file key from database