def __intermediate_proto(self, interface, address):
<EOL>address_proto = address.pop('<STR_LIT>', '<STR_LIT>')<EOL>if '<STR_LIT>' not in interface:<EOL><INDENT>return address_proto<EOL><DEDENT>else:<EOL><INDENT>return interface.pop('<STR_LIT>')<EOL><DEDENT>
determines UCI interface "proto" option