# DAY 05 - 函式 ###### tags: `python教學`,`函式`,`副程式` #### 定義函式結構 ```python= def HW(): print("Hello World function") ``` 此時只有定義，運行他不會動 ```python= HW() #輸出結果：Hello World function ``` #### 傳入引數 ```python= def HW(name): print("Hello World", name) ``` ```python= HW("julian") #輸出結果：Hello World julian ``` #### 練習：印出下列句子 「''」內的字請使用者輸入 I have a 'dog' and its name is 'tony' I have a 'cat' and its name is 'candy' #### 返回值 輸入 台中市 輸入 清水區 輸入 436 輸出 台中市 清水區 436 ```python= def get_location(city, area, zipcode): location = city + ' ' + area + ' ' + zipcode return location ``` #### 傳入串列 ```python= def call_student(names): for name in names: print("Hi, "+name) student = ["alan" , "jack" , "rose" , "bonny", "stan"] call_student(student) ``` #### 傳入任意數量的引數到函式 *names參數中的星號(*)會讓python建立一個名字為names的空多元組 ```python= def call_num_student(*names): for name in names: print("Hi, "+name) call_num_student("alan" , "jack" , "rose" , "bonny", "stan", "julian") ``` #### 練習 - 自製平方函式 sqr(x) :::spoiler 解答 ```python= def sqr(num): return num*num ``` ::: #### 練習 - 最大公因數 gdc(x,y) 提示：while(x%y != 0) :::spoiler 解答 ```python= def gcd(x,y): tmp = 0 while(x%y != 0): tmp = y y = x%y x = tmp return y ``` ::: #### HomeWork - 費氏數列(斐波那契数) 0,1,1,2,3,5,8,13,21,34,55,...... ![](https://i.imgur.com/TYpu1u2.png) :::spoiler 解答 7/22 :::