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Python 函数完全指南(中):参数、解包与返回值

  • 2026-08-18 23:12:09
Python 函数完全指南(中):参数、解包与返回值

掌握函数的基本结构后,本篇集中梳理位置参数、关键字参数、默认参数、可变参数、打包与解包,并说明 return 的执行规则。

本篇目录

5. 参数的传递方式

6. 可变参数

7. 参数的打包与解包

8. 函数的返回值


5. 参数的传递方式

5.1 位置参数

位置参数按照实参出现的位置,与形参从左到右依次对应。

def user_info(name, age):  print(f"姓名:{name}")  print(f"年龄:{age}")user_info("张三", 18)

位置参数的顺序和数量必须符合函数定义,否则可能传错数据或抛出 TypeError

5.2 关键字参数

关键字参数使用 形参名=实参值 的形式传递,因此不受书写顺序影响。

def person_info(name, age, city):  print(f"姓名:{name},年龄:{age},城市:{city}")person_info(age=25, name="小红", city="上海")person_info(city="广州", age=30, name="小李")

位置参数和关键字参数可以混用,但位置参数必须写在关键字参数前面:

def student_info(name, age, gender):  print(name, age, gender)student_info("张三", age=18, gender="男")student_info("李四", gender="女", age=20)

同一个参数不能重复传值:

# "张三" 已经传给 name,再写 name="李四" 会报错# student_info("张三", name="李四", age=18, gender="男")

5.3 默认参数

定义函数时可以提前给参数设置默认值。调用时不传该参数,就使用默认值;主动传值,则覆盖默认值。

def student_info(name, age, gender="男"):  print(f"姓名:{name}")  print(f"年龄:{age}")  print(f"性别:{gender}")student_info("张三", 18)          # gender 使用默认值student_info("李四", 20, "女")    # 覆盖默认值student_info("王五", 22, gender="女")

在普通参数列表中,没有默认值的参数必须放在有默认值参数之前:

def func(a, b=10):  print(a, b)# 下面的定义不合法:# def func(a=10, b):#     pass

print() 就使用了多个默认参数:

print("Python", "Java")                  # 默认 sep=" "print("Python", "Java", sep=" | ")       # 修改分隔符print("不换行", end="")                   # 修改结束字符print(",继续输出")

• sep=" ":多个输出值之间默认使用空格分隔。

• end="\n":输出结束后默认追加换行符。

5.4 仅限位置参数:/

函数定义中,/ 前面的参数只能通过位置传递,不能写成关键字参数。

def func(a, b, /, c, d):  print(a, b, c, d)func(10, 20, 30, 40)func(10, 20, c=30, d=40)# a、b 不能使用关键字传递# func(a=10, b=20, c=30, d=40)

5.5 仅限关键字参数:*

函数定义中,单独出现的 * 表示它后面的参数只能通过关键字传递。

def func(e, f, *, g, h):  print(e, f, g, h)func(10, 20, g=30, h=40)func(10, 20, h=40, g=30)# g、h 不能使用位置传递# func(10, 20, 30, 40)

5.6 混合限制

def func(a, b, /, c, d, *, e, f):  print(a, b, c, d, e, f)# a、b:只能按位置传递# c、d:位置或关键字均可# e、f:只能按关键字传递func(10, 20, 30, 40, e=50, f=60)func(10, 20, c=30, d=40, e=50, f=60)

可以使用一句口诀记忆:

/ 前面只能按位置传递* 后面只能按关键字传递中间两种方式都可以

6. 可变参数

当函数无法提前确定会收到多少个参数时,可以使用可变参数。

6.1 *args:接收任意多个位置参数

*args 会把所有额外的位置参数打包成一个元组。

def show_args(*args):  print(args)  print(type(args))show_args()                       # ()show_args(10)                     # (10,)show_args(1, 2, "Python", True)   # (1, 2, "Python", True)

args 只是约定俗成的名称,真正产生打包效果的是 *

def sum_numbers(*numbers):  total = 0  for number in numbers:    total += number  return totalprint(sum_numbers())print(sum_numbers(1, 2))print(sum_numbers(1, 2, 3, 4, 5))

6.2 **kwargs:接收任意多个关键字参数

**kwargs 会把所有额外的关键字参数打包成一个字典。

def show_user(**kwargs):  print(kwargs)  print(type(kwargs))  for key, value in kwargs.items():    print(f"{key} = {value}")show_user()show_user(name="张三", age=18, gender="男")show_user(city="上海", job="老师", salary=8000)

kwargs 是 keyword arguments 的缩写,同样只是常见命名,真正产生效果的是 **

6.3 多种参数组合

常见组合如下:

def func(name, age=18, *args, **kwargs):  print("name:", name)  print("age:", age)  print("args:", args)  print("kwargs:", kwargs)func("张三")func("李四", 20)func("王五", 22, "Python", 3.14)func("赵六", 19, "篮球", height=180, weight=75)

完整的参数定义顺序可以记为:

仅限位置参数→ 普通位置或关键字参数→ *args→ 仅限关键字参数→ **kwargs

默认值可以出现在允许的位置上,但必须符合 Python 的语法约束。


7. 参数的打包与解包

7.1 定义函数时:打包

• *args:把多个位置参数打包为元组。

• **kwargs:把多个关键字参数打包为字典。

def show_info(*args, **kwargs):  print("位置参数:", args)  print("关键字参数:", kwargs)show_info(11, 22, 33, name="lili", age=21)

7.2 调用函数时:解包

• *可迭代对象:拆成多个位置参数。

• **字典:拆成多个关键字参数,字典键必须与形参名对应,并且必须是字符串。

def show_info(name, age, city):  print(name, age, city)values = ("小明", 18)options = {"city": "北京"}show_info(*values, **options)

等价于:

show_info("小明", 18, city="北京")

打包与解包的区别取决于出现位置:

出现位置
*
 的作用
**
 的作用
定义函数
收集位置参数,打包成元组
收集关键字参数,打包成字典
调用函数
拆开可迭代对象,传成位置参数
拆开字典,传成关键字参数

8. 函数的返回值

8.1 return 的两个作用

return 同时具有两个作用:

1. 结束当前函数;

2. 把数据返回给调用者。

def add(a, b):  return a + bresult = add(10, 20)print(result)

执行到 return 后,当前函数立即结束,后面的代码不会继续执行:

def test():  print("return 之前")  return 100  print("这行不会执行")

return 不一定写在函数的最后一行,它经常与条件判断结合,用于提前结束函数:

def check_age(age):  if age < 0:    return "年龄不能小于 0"  if age < 18:    return "未成年"  return "成年"

8.2 没有显式返回值

函数没有写 return,或者只写了 return,都会返回 None

def say_hello():  print("Hello")result = say_hello()print(result)        # Noneprint(type(result))  # <class 'NoneType'>

注意:打印和返回是两件不同的事。

def add_and_print(a, b):  print(a + b)  # 只是显示结果,没有把结果返回result = add_and_print(1, 2)print(result)  # None

8.3 返回多个值

Python 函数可以一次返回多个值,这些值实际上会被打包成元组。

def calculate(x, y):  return x + y, x - yresult = calculate(10, 3)print(result)        # (13, 7)print(type(result))  # <class 'tuple'>

也可以直接解包接收:

total, difference = calculate(10, 3)print(total)print(difference)

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  1. CONNECT:[ UseTime:0.000410s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000635s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007808s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000313s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000628s ]
  6. SELECT * FROM `set` [ RunTime:0.005520s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000626s ]
  8. SELECT * FROM `article` WHERE `id` = 510652 LIMIT 1 [ RunTime:0.009801s ]
  9. UPDATE `article` SET `lasttime` = 1787294416 WHERE `id` = 510652 [ RunTime:0.001519s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000342s ]
  11. SELECT * FROM `article` WHERE `id` < 510652 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003510s ]
  12. SELECT * FROM `article` WHERE `id` > 510652 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015807s ]
  13. SELECT * FROM `article` WHERE `id` < 510652 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004690s ]
  14. SELECT * FROM `article` WHERE `id` < 510652 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023317s ]
  15. SELECT * FROM `article` WHERE `id` < 510652 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011185s ]
0.154910s