def make_market(self, crypto, fiat, seperator="<STR_LIT:_>"):
return ("<STR_LIT>" % (<EOL>self.fix_symbol(crypto), seperator, self.fix_symbol(fiat))<EOL>).lower()<EOL>
Convert a crypto and fiat to a "market" string. All exchanges use their
own format for specifying markets. Subclasses can define their own
implementation.