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梳理下python中的*args和**kwargs

  • 2026-03-07 03:55:44
梳理下python中的*args和**kwargs

一、核心概念与用法

简单来说,*args 用于接收任意数量的位置参数**kwargs 用于接收任意数量的关键字参数。它们本质上是一种语法约定(名字可以改,但 * 和 ** 是核心),目的是让函数能处理不确定数量的参数。

1. *args:可变位置参数

  • 作用:将传入的多个位置参数打包成一个元组 (tuple),函数内部可以像操作元组一样使用 args
  • 示例代码
def print_args(*args):
    # 打印args的类型(是元组)
    print("args的类型:", type(args))
    # 遍历输出所有位置参数
    for index, value in enumerate(args):
        print(f"第{index+1}个位置参数: {value}")

# 调用函数,传入任意数量的位置参数
print_args(10, "Python", [1,2,3], True)
print_args("单独一个参数")  # 也可以只传1个,甚至不传
  • 输出结果
args的类型: <class 'tuple'>
第1个位置参数: 10
第2个位置参数: Python
第3个位置参数: [1,2,3]
第4个位置参数: True
args的类型: <class 'tuple'>
第1个位置参数: 单独一个参数

2. **kwargs:可变关键字参数

  • 作用:将传入的多个关键字参数打包成一个字典 (dict),函数内部可以像操作字典一样使用 kwargs
def print_kwargs(**kwargs):
    # 打印kwargs的类型(是字典)
    print("kwargs的类型:", type(kwargs))
    # 遍历输出所有关键字参数(键值对)
    for key, value in kwargs.items():
        print(f"关键字参数 {key} = {value}")

# 调用函数,传入任意数量的关键字参数
print_kwargs(name="小明", age=18, city="北京")
print_kwargs(subject="数学", score=95)  # 不同的关键字参数也可以
  • 输出结果

plaintext

kwargs的类型: <class 'dict'>
关键字参数 name = 小明
关键字参数 age = 18
关键字参数 city = 北京
kwargs的类型: <class 'dict'>
关键字参数 subject = 数学
关键字参数 score = 95

3. 结合使用(顺序很重要)

当函数同时有普通参数、*args**kwargs 时,必须按以下顺序定义普通参数 → *args → **kwargs

def mix_params(name, *args, **kwargs):
    print(f"固定参数: {name}")
    print("位置参数列表:", args)
    print("关键字参数字典:", kwargs)

# 调用示例
mix_params("小红", 18, 170, city="上海", hobby="读书")
  • 输出结果
固定参数: 小红
位置参数列表: (18, 170)
关键字参数字典: {'city': '上海', 'hobby': '读书'}

二、实际应用场景

  1. 函数扩展:比如封装一个通用的打印函数,支持任意参数;
  2. 装饰器:装饰器需要适配被装饰函数的各种参数形式,*args 和 **kwargs 是必备;
  3. 调用其他函数:比如传递参数给另一个函数时,用 *args 解包位置参数,**kwargs 解包关键字参数:
def add(a, b):
    return a + b

# 用*args解包元组作为位置参数
params = (3, 5)
print(add(*params))  # 输出 8

# 用**kwargs解包字典作为关键字参数
kwargs = {"a": 4, "b": 6}
print(add(**kwargs))  # 输出 10

总结

  1. *args 接收任意数量的位置参数,打包成元组;**kwargs 接收任意数量的关键字参数,打包成字典;
  2. *args**kwargs 名称可以修改,只要前面带 * 或 ** 就行。但强烈推荐用*args**kwargs—— 这是 Python 开发者的通用约定;
  3. 函数定义时,参数顺序必须是:普通参数 → *args → **kwargs
  4. 核心价值是让函数支持可变数量的参数,提升代码的灵活性和通用性,常见于装饰器、通用工具函数等场景。

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  1. CONNECT:[ UseTime:0.000858s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000640s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000270s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000484s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000519s ]
  8. SELECT * FROM `article` WHERE `id` = 477703 LIMIT 1 [ RunTime:0.003134s ]
  9. UPDATE `article` SET `lasttime` = 1774646369 WHERE `id` = 477703 [ RunTime:0.005702s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000248s ]
  11. SELECT * FROM `article` WHERE `id` < 477703 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000645s ]
  12. SELECT * FROM `article` WHERE `id` > 477703 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001796s ]
  13. SELECT * FROM `article` WHERE `id` < 477703 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003085s ]
  14. SELECT * FROM `article` WHERE `id` < 477703 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014734s ]
  15. SELECT * FROM `article` WHERE `id` < 477703 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012511s ]
0.192527s