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Python第十三天:可变参数让函数更灵活,任意数量参数轻松处理,对比C语言太方便

  • 2026-04-20 13:27:27
Python第十三天:可变参数让函数更灵活,任意数量参数轻松处理,对比C语言太方便

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-begin-

函数让代码实现了复用,但如果函数参数个数不固定,比如有时需要计算两个数的和,有时需要计算三个数、四个数的和,总不能每次都定义新函数吧?Python的可变参数就能解决这个问题——它允许函数接收任意数量的参数,灵活应对不同场景,而C语言处理可变参数需要借助专门的库函数,语法复杂且容易出错。

第十三天:可变参数——让函数“按需接收”参数

Python例子

# 定义带可变参数的函数:计算任意个数的和(*args接收位置参数,打包成元组)

def sum_all(*args):

   total = 0

   for num in args:

       total += num

   return total

# 调用函数,传入不同数量的参数

print("两个数的和:", sum_all(3, 5))  # 8

print("三个数的和:", sum_all(1, 2, 3))  # 6

print("四个数的和:", sum_all(10, 20, 30, 40))  # 100

# 定义带关键字可变参数的函数:打印任意键值对(**kwargs接收关键字参数,打包成字典)

def print_kwargs(** kwargs):

   for key, value in kwargs.items():

       print(f"{key}:{value}")

# 调用函数,传入不同的关键字参数

print_kwargs(name="张三", age=18, score=90)

print_kwargs(city="北京", weather="晴朗")

运行结果

两个数的和: 8

三个数的和: 6

四个数的和: 100

name:张三

age:18

score:90

city:北京

weather:晴朗

详细分析

1.位置可变参数(*args)
定义函数时,在参数名前加*,表示该参数可以接收任意数量的位置参数。
这些参数会被打包成一个元组(tuple),在函数内部可以像遍历元组一样处理。
比如sum_all(3,5)中,args就是(3,5)sum_all(1,2,3)中,args就是(1,2,3)
2.**关键字可变参数(kwargs)
定义函数时,在参数名前加**,表示该参数可以接收任意数量的关键字参数(格式为键=值)。
这些参数会被打包成一个字典(dictionary),在函数内部可以通过键访问对应的值。
比如print_kwargs(name="张三", age=18)中,kwargs就是{"name": "张三", "age": 18}
3.混合使用

可变参数可以和普通参数一起使用,但顺序有讲究:普通参数 →*args**kwargs。例如:

def func(a, b, *args, **kwargs):

   print("普通参数a:", a)

   print("普通参数b:", b)

   print("可变位置参数:", args)

   print("可变关键字参数:", kwargs)

func(1, 2, 3, 4, x=5, y=6)

# 输出:

# 普通参数a: 1

# 普通参数b: 2

# 可变位置参数: (3, 4)

# 可变关键字参数: {'x': 5, 'y': 6}

对比C语言

C语言通过<stdarg.h>库处理可变参数,语法复杂:

#include <stdio.h>

#include <stdarg.h>  // 必须包含该头文件

// 计算n个数的和(n表示参数个数,后面跟n个int类型的数)

int sum_all(int n, ...) {

   va_list args;  // 定义参数列表变量

   va_start(args, n);  // 初始化参数列表,n是最后一个固定参数

   int total = 0;

   for (int i = 0; i < n; i++) {

       total += va_arg(args, int);  // 按int类型获取下一个参数

   }

   va_end(args);  // 清理参数列表

   return total;

}

int main() {

   printf("两个数的和:%d\n", sum_all(2, 3, 5));  // 8(第一个参数2表示后面有2个参数)

   printf("三个数的和:%d\n", sum_all(3, 1, 2, 3));  // 6

   return 0;

}

主要区别

4.易用性:Python的可变参数通过***轻松实现,无需手动指定参数个数和类型;C语言需要用va_listva_start等宏,还要提前确定参数个数和类型,容易出错(比如类型不匹配会导致结果异常)。
5.参数类型灵活性:Python的*args可以接收任意类型的参数(整数、字符串、列表等);C语言的可变参数需要提前声明类型(如va_arg(args, int)),无法动态处理不同类型。
6.关键字参数支持:Python的**kwargs原生支持关键字参数,调用时更清晰;C语言不支持关键字可变参数,只能按位置传递,参数含义不直观。
7.参数打包形式:Python自动将可变参数打包成元组或字典,方便遍历;C语言需要手动逐个提取参数,代码繁琐。
-end-

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  1. CONNECT:[ UseTime:0.001399s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001365s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000724s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.014481s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001390s ]
  6. SELECT * FROM `set` [ RunTime:0.001094s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001764s ]
  8. SELECT * FROM `article` WHERE `id` = 484593 LIMIT 1 [ RunTime:0.005736s ]
  9. UPDATE `article` SET `lasttime` = 1776694087 WHERE `id` = 484593 [ RunTime:0.004086s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000793s ]
  11. SELECT * FROM `article` WHERE `id` < 484593 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003448s ]
  12. SELECT * FROM `article` WHERE `id` > 484593 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009240s ]
  13. SELECT * FROM `article` WHERE `id` < 484593 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022425s ]
  14. SELECT * FROM `article` WHERE `id` < 484593 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014323s ]
  15. SELECT * FROM `article` WHERE `id` < 484593 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014807s ]
0.278554s