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                # 函數定義語法 ## def 函數() ~~~ def xiao(str1): a = 0 for i in str1: a += 1 print(a) xiao("s") ~~~ # 沒有返回值的函數 void類型的函數 直接返回 None ~~~ def xiao(): a = 10 for i in range(10): a -= 1 print(a) return None xiao() ~~~ ## 函數多返回值: ~~~ def test_return(): return 1,"hello",True x,y,z=test_return() print(x) print(y) print(z) ~~~ ![](https://img.kancloud.cn/e4/8c/e48c6db3c6198d2b4e317cd2ea50a643_1005x502.png) <br/> <br/> ## 缺省參數 以下與PHP類似 如果行參定義了值,如果不傳默認為形參值,傳遞了為實參值 ~~~ def user_info(name,age,gender="男"): print(f"姓名:{name},年齡{age},性別{gender}") user_info("小米",20,"女") ~~~ ![](https://img.kancloud.cn/d8/69/d8695de060d9cf80ab33e1fa4248da28_1241x372.png) ## 不定長參數: 1.位置傳遞 不定長參數也叫可變參數,用于不確定調用的時候,會傳遞多少個參數(不傳參也可也)的場景 作用:當調用函數時不確定參數個數時,可以使用不定長參數 不定長參數的類型: ## 位置傳遞參數 返回一個元組 ~~~ def user_info(*args): print(args) user_info("小米",20,"女") ~~~ ![](https://img.kancloud.cn/dd/de/ddde4af99e6ec2571de2f0eaac140297_1057x501.png) <br/> <br/> ## 2.關鍵字不定長 ## 關鍵字不定長 返回一個字典 ~~~ def user_info(**args): print(type(args)) user_info(name="小米",age=20,gender="女",addr="北京") #參數必須是帶有變量的 ~~~ ![](https://img.kancloud.cn/8c/e3/8ce332e62eb4cba62d587ac5264aa774_1386x518.png)
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