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【Python小白救星】定义函数?说白了就是给代码"装个快捷键"!

  • 2026-01-31 19:20:27
【Python小白救星】定义函数?说白了就是给代码"装个快捷键"!

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【Python小白救星】定义函数?说白了就是给代码"装个快捷键"!

咱学Python最怕啥?不是敲代码,是写一堆重复的代码——算个奶茶总价写一遍,算外卖总价又写一遍,手都敲酸了!而"定义函数"就是给这些重复活儿"定制快捷键",点一下就能用,比微信收藏常用语还香!

一、先唠透:啥是Python函数?(纯人话版)

先抛掉专业术语,咱用打工人的话翻译:

- 函数:就是把你常用的一段代码"打包"起来,起个好记的名字,比如"算奶茶总价""算打车费";

- 定义函数:就是制作这个"打包文件"的过程,相当于给你的常用操作"录个宏";

- 用函数:就是喊这个名字,让代码自动执行打包好的活儿,比如喊一声"算奶茶总价",代码就自动算完,不用再重写一遍。

举个栗子:你每天上班都要"打卡→开电脑→泡咖啡",要是把这三步打包成"上班开工()"函数,每天喊一声这个名字,三步自动完成,这就是定义函数的精髓——偷懒,但偷得有技术!

二、实操!3步搞定函数定义,小白也能秒会

光说不练假把式,咱从最简单的"无参数函数"开始,一步步解锁,代码都标了"人话注释",复制就能跑~

第一步:最基础的"无参数函数"(新手入门款)

就像你给"泡一杯拿铁"这个动作起个名字,不用额外交代,执行就完事!

python

#定义函数:def是"定义"的意思,函数名要见名知意,括号和冒号不能少!

def make_latte():

    # 函数里写要执行的代码

    print("1. 拿出杯子")

    print("2. 加浓缩咖啡")

    print("3. 加牛奶")

    print("✅ 拿铁泡好啦!")

#调用函数:喊函数名+括号,才会执行里面的代码(光定义不调用,等于白忙活!)

make_latte()

👉 运行结果(大白话版):

1. 拿出杯子

2. 加浓缩咖啡

3. 加牛奶

✅ 拿铁泡好啦!

第二步:带"参数"的函数(实用款)

有时候干活需要"原材料",比如泡咖啡要知道"加几分糖",参数就是给函数传"原材料"!

python

#定义带参数的函数:括号里的sugar就是"参数",相当于"糖的份数"

def make_coffee(sugar):

    print(f"1. 拿出杯子")

    print(f"2. 加浓缩咖啡")

    print(f"3. 加{sugar}分糖")

    print("✅ 咖啡泡好啦!")

#调用函数:括号里传具体的"原材料"(比如3分糖)

make_coffee(3)

#想换口味?直接改参数就行,不用重写整个代码!

make_coffee(0)  # 无糖版

👉 运行结果:

1. 拿出杯子

2. 加浓缩咖啡

3. 加3分糖

✅ 咖啡泡好啦!

1. 拿出杯子

2. 加浓缩咖啡

3. 加0分糖

✅ 咖啡泡好啦!

第三步:有"返回值"的函数(进阶版)

不光让函数"干活",还能让它"返回结果",比如算奶茶总价后,告诉你"一共多少钱"!

python

#定义有返回值的函数:计算奶茶总价(单价+加料费)

def calc_milk_tea_price(price, add_on):

    total = price + add_on  # 计算总价

    return total  # 返回结果,相当于"告诉老板算好的价格"

#调用函数:把返回的结果存起来,方便后续用

total_price = calc_milk_tea_price(18, 3)  # 奶茶18元,加料3元

print(f"你的奶茶总价:{total_price}元")

👉 运行结果:

你的奶茶总价:21元

三、避坑小彩蛋:新手最容易踩的3个坑

1. 别漏了冒号:def 函数名()后面必须加":",少了它Python直接"摆烂",跟你忘带钥匙进家门一个样!

2. 缩进要对齐:函数里的代码要缩进(一般4个空格),缩进乱了,Python会"认不出"这是函数里的活儿;

3. 光定义不调用=白干:就像你做了快捷键却从来不按,函数只会乖乖待着,不会自己执行~

总结

1. Python定义函数核心是"打包重复代码",用`def 函数名():`就能创建,调用时喊函数名+括号就行;

2. 参数是给函数传"原材料",返回值是让函数给你"交结果",新手先掌握无参数函数,再进阶带参数/返回值的;

3. 记住冒号、缩进、调用这三个关键点,能避开90%的函数定义坑。

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  1. CONNECT:[ UseTime:0.001004s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001655s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.101177s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.101026s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000754s ]
  6. SELECT * FROM `set` [ RunTime:0.100559s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000760s ]
  8. SELECT * FROM `article` WHERE `id` = 469963 LIMIT 1 [ RunTime:0.100617s ]
  9. UPDATE `article` SET `lasttime` = 1770442358 WHERE `id` = 469963 [ RunTime:2.146497s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.041245s ]
  11. SELECT * FROM `article` WHERE `id` < 469963 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.088603s ]
  12. SELECT * FROM `article` WHERE `id` > 469963 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004198s ]
  13. SELECT * FROM `article` WHERE `id` < 469963 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.213568s ]
  14. SELECT * FROM `article` WHERE `id` < 469963 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.075244s ]
  15. SELECT * FROM `article` WHERE `id` < 469963 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.036557s ]
3.091077s