exp = "SCREEN(U(IN(Equity(active,public,primary))), IN(TR.ExchangeCountryCode,CA), CURN=CAD)" exp = "SCREEN(U(IN(Equity(active,public,private,primary))), Contains(TR.CommonName,%s), CURN=CAD)" %name fields = ["TR.CompanyName"] df,e = ek.get_data(exp, fields) The first exp works, but the second one does not. How is the "Contains" argument supposed to be used?