??????????????
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>173</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>174</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>175</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>176</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>177</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/mybf1/public_html/mentol.bf1.my/SS1.php:4) in <b>/home/mybf1/public_html/mentol.bf1.my/SS1.php</b> on line <b>178</b><br />
class ExportableInterface(object):
	pass

class ExporterInterface(object):
	def export(self, method, in_signature, out_signature):
		# to be overridden by concrete implementation
		raise NotImplementedError()

	def signal(self, method, out_signature):
		# to be overridden by concrete implementation
		raise NotImplementedError()

	def send_signal(self, signal, *args, **kwargs):
		# to be overridden by concrete implementation
		raise NotImplementedError()

	def start(self):
		raise NotImplementedError()

	def stop(self):
		raise NotImplementedError()