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Python 函数参数超详细完整教程

  • 2026-08-19 01:07:56
Python 函数参数超详细完整教程

一、函数参数总分类

Python 函数参数分为 5 大类,执行优先级(定义顺序)严格固定:

  1. 位置形参(必选参数)
  2. 默认参数
  3. 可变位置参数 *args
  4. 仅关键字参数
  5. **可变关键字参数 **kwargs

调用时传参分为:位置实参、关键字实参、解包参数。

完整标准函数模板顺序:

deffunc(位置参数, 默认参数=值, *args, 仅关键字参数, **kwargs):
pass

二、1. 位置参数(必选参数)

定义规则

定义时直接写变量名,调用必须按顺序传入对应数量,缺一不可,不能跳过。

示例

# a、b 是位置形参,必须传2个值
defadd(a, b):
return a + b

add(1020)   # 正确:位置实参,10赋值a,20赋值b
add(10)       # 报错:缺少1个位置参数
add(10,20,30# 报错:传参过多

特点

  1. 调用实参与形参一一对应、顺序不能乱
  2. 无默认值,属于必填参数
  3. 必须写在所有参数最前面

三、2. 默认参数(缺省参数)

定义规则

定义形参时赋值 param=value,调用不传参自动使用默认值;传参则覆盖默认值。

基础示例

defpower(x, n=2):# n默认=2
return x ** n

print(power(3))     # 不传n,3²=9
print(power(3,3))   # 传参覆盖默认,3³=27

重点大坑:默认参数不能用可变对象(list/dict/set)

Python 默认参数仅在函数定义时初始化一次,多次调用会共用同一个可变对象:

# 错误示范
defappend_item(item, lst=[]):
    lst.append(item)
return lst

print(append_item(1))  # [1]
print(append_item(2))  # [1,2] 意外保留上次数据!
print(append_item(3))  # [1,2,3]

正确写法:默认值设为 None,函数内部创建可变对象

defappend_item(item, lst=None):
if lst isNone:
        lst = []
    lst.append(item)
return lst

print(append_item(1)) # [1]
print(append_item(2)) # [2] 正常独立列表

位置参数与默认参数顺序约束

默认参数必须放在位置参数后面,否则语法报错:

deffunc(a=10, b):# 语法错误!带默认值不能放前面
pass

四、3. 可变位置参数 *args

作用

接收任意多个位置实参,打包成**元组(tuple)**,解决参数数量不确定场景。

语法规则

  1. 符号 * + 变量名(约定俗成用 args,可自定义)
  2. 必须放在位置参数、默认参数之后
  3. 只能接收位置实参,不接收关键字实参

示例

defcalc_sum(a, b=0, *args):
    total = a + b
for num in args:
        total += num
return total

print(calc_sum(1))          # a=1,b=0,args=() → 1
print(calc_sum(1,2))        # a=1,b=2,args=() →3
print(calc_sum(1,2,3,4,5))  # args=(3,4,5) →15

实参解包 *列表/元组

调用函数时,* 可将序列拆开为独立位置参数:

deffoo(*args):
    print(args)

lst = [10,20,30]
foo(*lst)  # 等价 foo(10,20,30) → (10,20,30)

五、4. 仅关键字参数(Keyword-only)

作用

强制调用时必须使用关键字传参,不能用位置传参,放在 *args 之后 / 单独 * 后面。

两种定义方式

方式1:写在 *args 后面

deffunc(a, *args, x, y):
    print(a, args, x, y)

func(12,3, x=10, y=20# 正确,x、y必须关键字传参
func(1,2,3,10,20)        # 报错,不能用位置赋值x,y

方式2:单独 * 占位(无可变位置参数)

只用 * 分割,后面全部是仅关键字参数:

defstudent(name, *, age, score):
    print(name, age, score)

student("小明", age=18, score=90# 正确
student("小明",18,90)             # 报错

适用场景

区分必选关键字参数,防止位置传参混淆,代码可读性更高。


六、5. 可变关键字参数 **kwargs

作用

接收任意多个关键字实参,打包成**字典(dict)**,收集未匹配的关键字参数。

语法规则

  1. ** + 变量名(约定 kwargs)
  2. 必须放在所有参数最后一位
  3. 仅接收 key=value 关键字实参

示例

defuser_info(name, age, **kwargs):
    print("姓名", name)
    print("年龄", age)
    print("额外信息", kwargs) # 字典存储

user_info("小红"20, gender="女", city="西安")
# kwargs = {"gender":"女", "city":"西安"}

实参字典解包 **字典

调用时 **dict 将字典拆分为独立关键字参数:

defshow(**kwargs):
    print(kwargs)

info = {"height":175"weight":60}
show(**info) # 等价 show(height=175, weight=60)

完整参数顺序综合案例(全覆盖)

包含全部5类参数,严格顺序不可打乱:

deffull_demo(a, b=10, *args, x, y=100, **kwargs):
    print("位置参数a:", a)
    print("默认参数b:", b)
    print("可变位置args元组:", args)
    print("仅关键字x:", x)
    print("带默认仅关键字y:", y)
    print("可变关键字kwargs字典:", kwargs)

# 调用示例
full_demo(
1,          # 位置a
2,          # 覆盖默认b
3,4,5,      # *args
    x=6,        # 必选仅关键字
    y=7,        # 覆盖y默认值
    city="西安", job="程序员"# **kwargs
)

七、调用函数的两种传参方式

1. 位置传参

按顺序匹配形参,简洁但参数多易混乱

deffunc(a,b,c):pass
func(1,2,3)

2. 关键字传参

指定 形参名=值,顺序随意,可读性强

func(c=3, a=1, b=2)

混合传参规则(强制约束)

  1. 位置实参必须写在关键字实参前面
  2. 同一个参数不能同时用位置+关键字重复传值
func(1, b=2, c=3# 正确
func(a=12,3)    # 语法错误:关键字在前
func(1, a=10)     # 报错:重复赋值a

八、特殊进阶参数

1. 函数注解(参数类型提示)

仅提示,不强制类型校验,提升代码可读性:

# 语法:参数名:类型,返回值->类型
defadd(a: int, b: int) -> int:
return a + b

# 默认值搭配注解
defpower(x: float, n: int = 2) -> float:
return x ** n

2. 动态参数汇总解包技巧

deftest(a, b, *args, x, **kwargs):
pass

# 序列解包 * 传位置参数
nums = [10,20,30,40]
# 字典解包 ** 传关键字参数
extra = {"x":99"city":"西安"}

test(*nums, **extra)
# 等价 test(10,20,30,40, x=99, city="西安")

3. 递归函数参数 / 高阶函数传参

参数可传递函数对象:

defcalc(func, num1, num2):
return func(num1, num2)

defmul(x,y):return x*y

print(calc(mul, 3,4)) # 12

九、常见报错与原因总结

  1. TypeError: missing positional argument缺少必填位置参数,未传足够实参
  2. SyntaxError: non-default argument follows default argument默认参数写在位置参数前面
  3. TypeError: multiple values for argument同一个参数同时用位置+关键字传参
  4. TypeError: takes X positional arguments but Y were given传入多余位置参数,无 *args 接收
  5. 默认可变参数残留数据 列表/字典作为默认值,改用 None 内部初始化

十、参数使用场景选择建议

  1. 固定数量参数 → 只用位置参数
  2. 大部分场景统一值,少量自定义 → 默认参数
  3. 参数数量不确定、批量接收数值 → *args
  4. 防止传参顺序混乱,强制命名传参 → 仅关键字参数
  5. 不确定的拓展字段(用户属性、配置)→ **kwargs
  6. 通用工具函数(兼容任意入参)→ def func(*args,**kwargs)

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  1. CONNECT:[ UseTime:0.001013s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001454s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.009201s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001936s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001309s ]
  6. SELECT * FROM `set` [ RunTime:0.024152s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001808s ]
  8. SELECT * FROM `article` WHERE `id` = 504328 LIMIT 1 [ RunTime:0.073512s ]
  9. UPDATE `article` SET `lasttime` = 1787332853 WHERE `id` = 504328 [ RunTime:0.040245s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005820s ]
  11. SELECT * FROM `article` WHERE `id` < 504328 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001165s ]
  12. SELECT * FROM `article` WHERE `id` > 504328 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.039972s ]
  13. SELECT * FROM `article` WHERE `id` < 504328 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.060385s ]
  14. SELECT * FROM `article` WHERE `id` < 504328 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.017649s ]
  15. SELECT * FROM `article` WHERE `id` < 504328 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.050729s ]
0.501619s