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Python 函数关键字参数完整详解

  • 2026-08-18 23:11:13
Python 函数关键字参数完整详解

一、基础概念:什么是关键字参数

Python 调用函数时传参分两种:位置参数关键字参数

  • 位置参数:按参数顺序一一对应,不能打乱顺序
  • 关键字参数:调用函数时,通过 形参名=值 的形式显式指定传给哪个参数,不受顺序限制

语法格式

# 定义函数
deffunc(a, b, c):
pass

# 关键字传参(顺序随意)
func(b=2, a=1, c=3)

二、关键字参数核心特性

1. 传参顺序不受限制

普通位置参数必须严格匹配定义顺序,关键字参数可任意调换:

defstudent(name, age, gender):
    print(f"姓名:{name}, 年龄:{age}, 性别:{gender}")

# 纯位置参数(顺序固定)
student("小明"18"男")

# 纯关键字参数,顺序打乱完全没问题
student(gender="女", name="小红", age=17)

输出:

姓名:小明, 年龄:18, 性别:男
姓名:小红, 年龄:17, 性别:女

2. 位置参数必须写在关键字参数前面(硬性规则)

报错规则:调用函数时,位置参数不能出现在关键字参数后面

deftest(x, y):
pass

# 合法:位置在前,关键字在后
test(10, y=20)

# 非法:关键字在前,位置在后 → SyntaxError
test(x=1020)

3. 同一个参数不能重复传值

不能同时用位置+关键字给同一个形参赋值,会触发 TypeError

defadd(a, b):
return a + b

# 错误:a 既用位置传了1,又关键字传了10
add(1, a=10, b=2)
# TypeError: multiple values for argument 'a'

4. 关键字参数只能匹配函数已定义的形参

不能传入函数不存在的参数名,直接报错

defcalc(m, n):
pass

calc(m=5, k=6)  # k不是函数参数,报错
# TypeError: calc() got an unexpected keyword argument 'k'

三、函数定义层面:默认参数(带关键字属性)

定义函数时给形参赋值,就是默认关键字参数,调用时可省略不传:

defuser_info(name, age=18, city="北京"):
    print(name, age, city)

# 只传必填位置参数,默认参数自动生效
user_info("小李")

# 覆盖默认值,只修改city
user_info("小张", city="上海")

# 全部手动指定
user_info("小王", age=22, city="广州")

输出:

小李 18 北京
小张 18 上海
小王 22 广州

定义规则:带默认值的参数必须放在无默认值参数后面,否则语法报错

# 错误写法
deffunc(a=10, b):
pass

四、可变关键字参数 **kwargs(收集所有多余关键字参数)

1. 作用

捕获所有未匹配到普通形参的关键字参数,打包成字典存入 kwargs(约定变量名,可自定义) 语法:def 函数名(**kwargs):

示例1:基础收集

defprint_msg(**kwargs):
    print(kwargs, type(kwargs))
for k, v in kwargs.items():
        print(f"{k}{v}")

# 传入任意多关键字参数
print_msg(name="莉莉", height=165, hobby="画画")

输出:

{'name''莉莉''height': 165, 'hobby''画画'} <class 'dict'>
name: 莉莉
height: 165
hobby: 画画

2. 普通参数 + **kwargs 混用

普通形参接收固定关键字,多余的全部进 kwargs

defgoods(name, price, **kwargs):
    print(f"商品:{name}, 价格:{price}")
    print("其他属性:", kwargs)

goods("手机"3999, brand="华为", memory="256G")

输出:

商品:手机, 价格:3999
其他属性: {'brand''华为''memory''256G'}

3. 字典解包传参 **字典

调用函数时,用 **dict 将字典自动拆解为多个关键字参数:

defperson(name, age, sex):
    print(name, age, sex)

info = {"name""阿杰""age"20"sex""男"}
# 字典解包,等价于 person(name="阿杰", age=20, sex="男")
person(**info)

五、仅关键字参数(强制只能用关键字传参)

Python3 新增语法:仅关键字参数,必须用 参数=值 传参,禁止位置传参。 两种定义方式:

方式1:单星号 * 分隔

* 后面的所有形参,只能用关键字传入

defsend_email(to, *, subject, content):
    print(f"收件:{to}, 标题:{subject}, 内容:{content}")

# 合法:*后面参数使用关键字
send_email("admin@qq.com", subject="通知", content="放假通知")

# 非法:给subject传位置参数,直接报错
send_email("admin@qq.com""放假通知", content="xxx")
# TypeError: send_email() takes 1 positional argument but 3 were given

方式2:结合 *args

可变位置参数后的参数自动成为仅关键字参数

defcalc_sum(*nums, base):
return sum(nums) + base

# 必须关键字传base
print(calc_sum(1,2,3, base=10))  # 16
# calc_sum(1,2,3,10) 报错

六、参数完整顺序规范(最全优先级)

定义函数时,参数书写顺序必须严格遵守,否则语法错误:

  1. 必选位置参数
  2. 默认参数
  3. 可变位置参数 *args
  4. 仅关键字参数(含带默认值)
  5. 可变关键字参数 **kwargs

标准模板:

deffull_func(a, b=10, *args, c, d=20, **kwargs):
pass

调用传参顺序规则:

  1. 位置参数在前
  2. 关键字参数在后
  3. *可迭代对象 解包(列表/元组)
  4. **字典 解包放在最后

合法调用示例:

full_func(1234, c=5, d=6, x=100, y=200)
full_func(10, d=30, *(5,6), c=15, **{"z"99})

七、常见易错点总结

  1. 位置参数不能放在关键字参数之后
    func(a=12)  # 语法错误
  2. 同一参数不能重复赋值
    func(1, a=2# 重复传a,报错
  3. 默认参数陷阱:不要用可变对象(列表/字典)当默认值
    # 错误示范
    defappend_item(x, arr=[]):
        arr.append(x)
    return arr
    print(append_item(1))  # [1]
    print(append_item(2))  # [1,2] 列表复用,不会重置
    修正方案:
    defappend_item(x, arr=None):
    if arr isNone:
            arr = []
        arr.append(x)
    return arr
  4. **kwargs 只能接收关键字,不能接收位置参数
  5. 仅关键字参数必须显式写关键字,适合强制清晰传参(工具类函数常用)

八、实战应用场景

  1. 提高代码可读性:参数多时,关键字能一眼看懂每个值含义
    # 可读性差
    create_user(1"张三"18True)
    # 清晰易懂
    create_user(id=1, name="张三", age=18, is_vip=True)
  2. 函数参数扩展:使用 **kwargs 兼容未来新增参数,无需修改函数调用
  3. 字典批量传参:接口、数据库查询批量赋值
  4. 强制规范传参:仅关键字参数防止参数顺序传错引发bug

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  1. CONNECT:[ UseTime:0.000908s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001305s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.027427s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001784s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000985s ]
  6. SELECT * FROM `set` [ RunTime:0.012800s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002322s ]
  8. SELECT * FROM `article` WHERE `id` = 506437 LIMIT 1 [ RunTime:0.002625s ]
  9. UPDATE `article` SET `lasttime` = 1787294280 WHERE `id` = 506437 [ RunTime:0.035622s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.011945s ]
  11. SELECT * FROM `article` WHERE `id` < 506437 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007365s ]
  12. SELECT * FROM `article` WHERE `id` > 506437 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.038243s ]
  13. SELECT * FROM `article` WHERE `id` < 506437 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003305s ]
  14. SELECT * FROM `article` WHERE `id` < 506437 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004266s ]
  15. SELECT * FROM `article` WHERE `id` < 506437 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.036375s ]
0.272368s