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Python 函数的定义及函数的参数

  • 2026-02-26 00:57:35
Python 函数的定义及函数的参数
Python中函数的定义:
# 定义函数def 函数名(参数1, 参数2, ...):"""函数文档字符串(可选,用于说明函数功能)"""# 函数体:要执行的代码逻辑    执行语句# 返回值(可选,没有return则默认返回None)return 返回值# 调用函数函数名(参数1的值, 参数2的值, ...)
#函数定义#函数不带参数def my_fun1 ():print("定义了一个函数")#函数带参数 , 计算两个数的和def my_fun2 (a,b):print(a+b)#函数调用my_fun1()my_fun2(1,2)
Python中函数的参数有一下几中类型:
  1. 位置参数
  2. 默认参数
  3. 关键字参数
  4. 可变关键字参数
  5. 可变位置参数(4和5 可合称可变参数)
  6. 命名关键字参数
位置参数:
my_fun2(a,b) a和b就是两个位置参数,且调用my_fun2时,必须传入两个位置参数,如调用my_fun2时候没有带参数:
my_fun2()TypeError: my_fun2() missing 2 required positional arguments: 'a' and 'b'
默认参数:
def my_fun2 (a,b=2):print(a+b)my_fun2(1) #不传入b,使用默认值2,输出3my_fun2(5,6) ## 传入b,b值使用6,输出11
关键字参数:
定义时候函数本身只需按普通的位置参数 / 默认参数定义,调用时通过参数名=值的形式传参即可,这是关键字参数最基础的用法。
def person (name,age=18):print(f"姓名:{name},年龄:{age}")person("张三",20) #混合 位置参数+默认参数person("张三",age=20) #混合 位置参数+关键字参数(关键字参数必须在位置参数后)person(name="张三",age=20) person(age=20,name="张三"#纯关键字参数调用,位置可换person(20,"张三"#混合 位置参数+默认参数 (位置不可换)输出:姓名:张三,年龄:20姓名:张三,年龄:20姓名:张三,年龄:20姓名:张三,年龄:20姓名:20,年龄:张三
可变关键字参数:
如果想让函数接收任意数量、任意名称的关键字参数,需要用**kwargs(惯例用kwargs,也可以用其他名称如**aaa)来定义。
def person(**kwargs):# 函数内部,kwargs会被打包成字典print("接收的关键字参数:", kwargs)# 遍历获取所有关键字参数的名和值for key, value in kwargs.items():print(f"{key} = {value}")person(name="张三",age=18,city="SH")输出:接收的关键字参数: {'name''张三''age': 18, 'city''SH'}name = 张三age = 18city = SH
可变位置参数:
def sum_numbers(*args):"""计算任意数量数字的和"""    total = 0# args是一个元组,可以遍历for num in args:        total += numreturn total# 测试不同数量的参数print(sum_numbers(1, 2,5))          # 输出: 8print(sum_numbers(1, 2, 3, 4,6))    # 输出: 16print(sum_numbers())              # 输出: 0(不传参数也能正常运行)# 也可以将列表/元组解包后传入nums = [1, 2, 3]print(sum_numbers(*nums))         # 输出: 6(*用于解包)
命名关键字参数:

命名关键字参数是一种固定名称的关键字参数,强制调用者必须以「关键字形式」传入指定名称的参数,且参数名是预先定义好的,不能随意传入。要求:参数名固定、数量固定,调用时必须用关键字形式传参(不能按位置传);语法上需要先写一个 * 作为分隔符(如果前面有可变位置参数 *args,则 * 可省略),后面跟着具体的参数名。

# 方式1:用 * 作为分隔符,后面的 city、age 是命名关键字参数def print_person(name, *, city, age):print(f"姓名:{name},城市:{city},年龄:{age}")# 正确调用:必须用关键字形式传 city 和 ageprint_person("李四", city="上海", age=25)# 错误调用1:按位置传 city/age(会报错)# print_person("李四", "上海", 25)  # TypeError: print_person() takes 1 positional argument but 3 were given# 错误调用2:传入未定义的关键字参数(会报错)# print_person("李四", city="上海", age=25, gender="男")  # TypeError: print_person() got an unexpected keyword argument 'gender'# 方式2:前面有 *args,省略单独的 * 分隔符def print_person2(*args, city, age):print(f"位置参数:{args},城市:{city},年龄:{age}")print_person2("李四""学生", city="上海", age=25)  # 正确:args 接收 ("李四", "学生")输出:姓名:李四,城市:上海,年龄:25位置参数:('李四''学生'),城市:上海,年龄:25
多参数结合定义:
python官方顺序:
位置参数 → 默认参数 → 可变位置参数(*args) → 命名关键字参数 → 可变关键字参数(**kwargs);
# 完整的参数组合定义def func(a, b=10, *args, c, **kwargs):print(f"位置参数a: {a}")print(f"默认参数b: {b}")print(f"可变位置参数args: {args}")print(f"命名关键字参数c: {c}")print(f"可变关键字参数kwargs: {kwargs}")# 调用(注意传参顺序)func(1, 2, 3, 4, c=5, d=6, e=7)# 输出:# 位置参数a: 1# 默认参数b: 2# 可变位置参数args: (3, 4)# 命名关键字参数c: 5# 可变关键字参数kwargs: {'d': 6, 'e': 7}

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  1. CONNECT:[ UseTime:0.000644s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001054s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000746s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000332s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000712s ]
  6. SELECT * FROM `set` [ RunTime:0.000769s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000670s ]
  8. SELECT * FROM `article` WHERE `id` = 477012 LIMIT 1 [ RunTime:0.002910s ]
  9. UPDATE `article` SET `lasttime` = 1772266106 WHERE `id` = 477012 [ RunTime:0.004548s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 477012 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000521s ]
  12. SELECT * FROM `article` WHERE `id` > 477012 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000457s ]
  13. SELECT * FROM `article` WHERE `id` < 477012 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003071s ]
  14. SELECT * FROM `article` WHERE `id` < 477012 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007187s ]
  15. SELECT * FROM `article` WHERE `id` < 477012 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007534s ]
0.176295s