我有一個(gè)字符串。我需要查找該字符串中的關(guān)鍵字是否存在于我的數(shù)據(jù)框中。如果存在，我需要返回該關(guān)鍵字。細(xì)繩：question="Joe is Available"question=question.upper()str_list=question.split()str_list出[107]：['JOE', 'IS', 'AVAILABLE']數(shù)據(jù)框：df=pd.DataFrame({"Person1":("Ash","Joe","Harry"),"Person2":("Abe","Lisa","Katty",),"Person3":("Sam","Max","Stone")})df=df.apply(lambda x: x.astype(str).str.upper())Person1 Person2 Person3ASH     ABE     SAMJOE     LISA    MAXHARRY   KATTY   STONE我的嘗試：return_field=""for x in str_list:    print(x)    for i in df.iterrows():        if(df.str.contains(x)):            return_field=x給我 AttributeError: 'DataFrame' 對(duì)象沒(méi)有屬性 'str'預(yù)期產(chǎn)出由于 Joe 出現(xiàn)在數(shù)據(jù)框中，它應(yīng)該返回我“Joe”