parameters: (self, url, base, quote)
docstring: Adds the orderbook to the url if base and quote are specified.
docstring_summary: Adds the orderbook to the url if base and quote are specified.
docstring_tokens: Adds the orderbook to the url if base and quote are specified .
function: def _construct_url(self, url, base, quote):
          """
          Adds the orderbook to the url if base and quote are specified.
          """
  
          if not base and not quote:
              return url
          else:
              url = url + base.lower() + quote.lower() + "/"
              return url
function_tokens: def _construct_url ( self , url , base , quote ) : if not base and not quote : return url else : url = url + base . lower ( ) + quote . lower ( ) + "/" return url