def METHOD_NAME(self):
    """
    Remove the exclusive lock. Second instance can now continue
    but should find it self to be obsolete.
    """
    if self.flock:
        fcntl.fcntl(self.flock, fcntl.LOCK_UN)
        self.flock.close()
        try:
            os.remove(self.flock.name)
        except:
            # an other instance was faster
            # race condition while using 'if os.path.exists(...)'
            pass
    self.flock = None