How to use the exabgp.bgp.message.open.asn.ASN function in exabgp

def _newASN (self, value):
		if value.count('.'):
			high,low = value.split('.',1)
			as_number = (int(high) << 16) + int(low)
		else:
			as_number = int(value)
		return ASN(as_number)

def _newASN (self,value):
		if value.count('.'):
			high,low = value.split('.',1)
			asn = (int(high) << 16) + int(low)
		else:
			asn = int(value)
		return ASN(asn)

def asn (tokeniser, value=None):
	value = tokeniser() if value is None else value
	try:
		if value.count('.'):
			high,low = value.split('.',1)
			as_number = (int(high) << 16) + int(low)
		else:
			as_number = int(value)
		return ASN(as_number)
	except ValueError:
		raise ValueError('"%s" is an invalid ASN' % value)

def _newASN (self,value):
		if value.count('.'):
			high,low = value.split('.',1)
			asn = (int(high) << 16) + int(low)
		else:
			asn = int(value)
		return ASN(asn)

def _route_aggregator (self,scope,tokens):
		try:
			if tokens:
				if tokens.pop(0) != '(':
					raise ValueError('invalid aggregator syntax')
				asn,address = tokens.pop(0).split(':')
				if tokens.pop(0) != ')':
					raise ValueError('invalid aggregator syntax')
				local_as = ASN(asn)
				local_address = RouterID(address)
			else:
				local_as = scope[-1]['local-as']
				local_address = scope[-1]['local-address']
		except (ValueError,IndexError):
			self._error = self._str_route_error
			if self.debug: raise
			return False
		except KeyError:
			self._error = 'local-as and/or local-address missing from neighbor/group to make aggregator'
			if self.debug: raise
			return False
		except ValueError:
			self._error = self._str_route_error
			if self.debug: raise
			return False

def unpack (cls, data, negotiated):
		if negotiated.asn4:
			return cls(ASN.unpack(data[:4]),IPv4.unpack(data[-4:]))
		return cls(ASN.unpack(data[:2]),IPv4.unpack(data[-4:]))

def unpack (data):
		asn,target = unpack('!HL',data[2:8])
		return TrafficRedirect(ASN(asn),target,data[:8])

def _flow_route_rate_limit (self,scope,tokens):
		# README: We are setting the ASN as zero as that what Juniper (and Arbor) did when we created a local flow route
		try:
			speed = int(tokens[0])
			if speed < 9600 and speed != 0:
				self.logger.warning("rate-limiting flow under 9600 bytes per seconds may not work",'configuration')
			if speed > 1000000000000:
				speed = 1000000000000
				self.logger.warning("rate-limiting changed for 1 000 000 000 000 bytes from %s" % tokens[0],'configuration')
			scope[-1]['routes'][-1].add_action(to_FlowTrafficRate(ASN(0),speed))
			return True
		except ValueError:
			self._error = self._str_route_error
			if self.debug: raise
			return False