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    --- tags : python --- # DAY 13 函式應用( 1 ) ## 返回簡單值 函式返回的值我們稱之為返回值,用法是用return陳述句把值返回到呼叫函式的那行程式碼中 範例如下 : ```python= def get_location(city,area,zipcode): # 定義一個get_location函式需要三個引數 location=city+" "+area+" "+zipcode return location # 返回location return_value=get_location("新北市","新莊區","242") # 把返回值指定存放在return_value變數中 print(return_value) ``` 輸出結果 : ```python 新北市 新莊區 242 ``` ## 返回字典 函式能夠返回各種型別的值,包括串列、字典等比較複雜的資料結構 範例如下 : ```python= def get_name(first_name,last_name): # get_name函式接收first_name和last_name name={"first":first_name,"last":last_name} # 將收到的first_name值對應到first鍵,將last_name值存到last鍵,再將兩的鍵值對存到name字典 return name # 返回name字典 return_value=get_name("bonny","chang") print(return_value) ``` 輸出結果 : ```python {'first': 'bonny', 'last': 'chang'} ``` ## 傳入串列 範例如下 : ```python= def get_name(names): for name in names: print("hello,"+name) usernames=["bonny","steven","jack","rose"] get_name(usernames) # 將usernames串列傳入get_name函式中 ``` 輸出結果 : ```python hello,bonny hello,steven hello,jack hello,rose ``` ## while迴圈使用函式 範例如下 : ```python= def get_name(first_name,last_name): name=first_name+" "+last_name return name while True: print("enter 'q' at any time to quit") # 新增一條文字告知使用者如何隨時跳出迴圈 first=input("enter your first name :") if first =="q": # 當使用者輸入"q"則跳出迴圈 break last=input("enter your last name :") if last =="q": # 當使用者輸入"q"則跳出迴圈 break print(get_name(first,last)) # 呼叫get_name函式接收輸入的first值和last值 ``` 輸出結果 : ```python enter 'q' at any time to quit enter your first name :bonny enter your last name :chang bonny chang enter 'q' at any time to quit enter your first name :q ``` #### 今天結束,各位明天見 :hand: *** 資料來源:<<python程式設計的樂趣>>-Eric Matthes著/H&C譯

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