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Python基础笔记6——函数

  • 2026-06-29 18:42:14
Python基础笔记6——函数

🔧 一、函数分类

Python中的内置函数:

https://docs.python.org/zh-cn/3.13/library/functions.html

Python中的模块:

https://docs.python.org/zh-cn/3.13/py-modindex.html


💻 二、函数的基本使用

定义函数的语法:

def 函数名(参数1, 参数2):    """这是函数的说明文档"""    # 函数体    return 返回值

来个最简单的例子:

def greet():    print("前端AI日志!")# 调用函数greet()  # 输出:前端AI日志!

就这么简单!定义一次,想调用几次就调用几次~


🎯 三、函数的参数(重头戏!)

1. 位置参数

# 按顺序传参。使用位置参数时,不能跳过某个位置的参数,去给后面的形参赋值。def introduce(name, age):    print(f"我叫{name},今年{age}岁")introduce("小明"18)  # 输出:我叫小明,今年18岁

2. 关键字参数

# 不用按顺序,直接指定参数名introduce(age=20, name="小红")  # 输出:我叫小红,今年20

3. 参数默认值

# 给参数一个默认值,不传就用默认的def buy_coffee(type="拿铁"):    print(f"来一杯{type}")buy_coffee()              # 输出:来一杯拿铁buy_coffee("美式")        # 输出:来一杯美式# 会报错,默认参数必须要放在必选参数的后面# def buy(type="美式",food):    # print(f"{food}{type}")

注意:默认参数必须要放在必选参数的后面,或者说:某个形参,一旦设置了默认值那它后面的所有形参,也必须要写默认值!

4. 可变参数

# 不确定要传几个参数时用这个:# *args:接收任意数量的位置参数,变成元组def sum_all(*args):    return sum(args)print(sum_all(1234))  # 输出:10# **kwargs:接收任意数量的关键字参数,变成字典def show_info(**kwargs):    print(kwargs)show_info(name="小明", age=18)  # 输出:{'name': '小明', 'age': 18}# 可变位置参数、可变关键字参数,也能与其他类型的参数一起使用。def test(a,b,*args,c,**kwargs):        print(a, b, args, c, kwargs)# 输出1 2 (3, 4) 5 {'d': 6, 'e': 7}test(1,2,3,4,c=5,d=6,e=7)

5. 限制传参方式

# *后面的只能用关键字参数def func(a, b, *, c, d):    print(a, b, c, d)func(12, c=3, d=4)  # 正确# func(1, 2, 3, 4)   # 报错!c和d必须用关键字参数# /前边只能用位置参数def func1(a, b, /, c, d):    print(a, b, c, d)func1(1,2, c=3, d=4)  # 正确func1(a=1,b=2,3,4) # 报错!a和b必须用位置参数

注意:/和*同时使用时,/必须在*的前面。


📤 四、返回值与 None

  1. None是一个特殊的字面量,它表示:空值/无值/无意义。

  2. None的类型是NoneType。

  3. None 转为布尔值是False。

  4. None不能参与数学运算,也不能与字符串拼接。

  5. 不给函数设置返回值,函数会默认返回None。

返回值用 return:

def add(a, b):    return a + bresult = add(35)print(result)  # 输出:8

特殊的 None:

def say_hello():    print("Hello")result = say_hello()print(result)  # 输出:None(因为没有return)

🌍 五、作用域:全局 vs 局部

局部变量:

在函数内部定义的变量,外面用不了:

a = 100def test():    x = 10  # 局部变量    x += 1    a = 200    print(x)test()# print(x)  # 报错!x在外面不存在# print(a) # 100,函数中的a和函数外的a不是一个变量,这与前端js中不一样# 局部作用域和局部变量,会在函数调用时创建,在函数执行结束后自动销毁test() # 此时输出依然是 11

全局变量:

在函数外部定义的变量,函数里能用,但要修改得加 global

y = 20  # 全局变量def test():    global y    y += 1    print(y)test()print(y)  # 输出:21# 全局作用域和全局变量,会在程序开始时创建,在程序结束后销毁test()print(y) # 输出:22

🔄 六、函数的嵌套调用

函数可以调用函数,就像套娃一样:

def test1():    print("进入 test1")    test2()    print("退出 test1")def test2():    print("进入 test2")    test3()    print("退出 test2")def test3():    print("进入 test3")    print(">>> 正在执行 test3")    print("退出 test3")test1()# 输出:# 进入 test1# 进入 test2# 进入 test3# >>> 正在执行 test3# 退出 test3# 退出 test2   👇 下图讲清楚了为啥先输出test2# 退出 test1   👇 下图讲清楚了为啥后输出test1
下图讲清楚了函数嵌套调用执行过程(栈:先进后出,前端JS也是如此)

♾️ 七、递归:函数自己调自己

递归调用(简称递归):是指函数自己调用自己的一种操作。

经典例子:计算阶乘

def factorial(n):    if n == 1:        return 1    return n * factorial(n - 1)print(factorial(5))  # 输出:120# 栈:先进后出示例def hello(n):    if n > 0:        hello(n-1)    print(f'你好{n}')hello(2)# 输出,这里与六中图里原理一样,栈:先进后出# 你好0# 你好1# 你好2
“先打印后递归”和“先递归后打印” 的代码,都会触发压栈,只是打印时机不同👇👇👇

📚 八、给函数写说明文档

好的函数一定要有说明文档,方便别人(也方便未来的自己)看懂:

def add(a, b):    """    计算两个数的和    参数:        a (int/float): 第一个数        b (int/float): 第二个数    返回:        int/float: 两数之和    """    return a + b# 查看说明文档print(add.__doc__)help(add)

🎮 九、综合案例:一个完整的计算器

def calculator(a, b, operation="+"):    """    简单的计算器函数    参数:        a (int/float): 第一个数        b (int/float): 第二个数        operation (str): 操作类型:+, -, *, /    返回:        int/float: 计算结果    """    if operation == "+":        return a + b    elif operation == "-":        return a - b    elif operation == "*":        return a * b    elif operation == "/":        if b == 0:            return "错误:除数不能为0"        return a / b    else:        return "错误:不支持的操作"# 测试一下print(calculator(105))             # 15print(calculator(105"-"))        # 5print(calculator(105"*"))        # 50print(calculator(105"/"))        # 2.0print(calculator(100"/"))        # 错误:除数不能为0

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  1. CONNECT:[ UseTime:0.001030s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001657s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000804s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000759s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001400s ]
  6. SELECT * FROM `set` [ RunTime:0.000692s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001483s ]
  8. SELECT * FROM `article` WHERE `id` = 493585 LIMIT 1 [ RunTime:0.001487s ]
  9. UPDATE `article` SET `lasttime` = 1783073443 WHERE `id` = 493585 [ RunTime:0.072840s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000740s ]
  11. SELECT * FROM `article` WHERE `id` < 493585 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.048244s ]
  12. SELECT * FROM `article` WHERE `id` > 493585 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001174s ]
  13. SELECT * FROM `article` WHERE `id` < 493585 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015009s ]
  14. SELECT * FROM `article` WHERE `id` < 493585 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.073101s ]
  15. SELECT * FROM `article` WHERE `id` < 493585 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002620s ]
0.387576s