A.pop B.clear C.del D.remove
A."hello" B.’hello’ C."" D.’’
A.函數(shù)必須有返回值 B.函數(shù)中所有的return都會(huì)執(zhí)行到 C.定義函數(shù)用def關(guān)鍵字 D.函數(shù)必須有參數(shù)