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Python 各类参数传递完整案例练习

  • 2026-08-18 23:11:31
Python 各类参数传递完整案例练习

包含:位置参数、关键字参数、默认参数、可变位置参数*args、可变关键字参数**kwargs、仅限位置参数/、仅限关键字参数*,附带易错坑点、练习题。

一、参数分类总览

  1. 位置参数(positional arguments):按顺序传参
  2. 关键字参数(keyword arguments):key=value 指定传参
  3. 默认参数(default parameters):定义时赋值,不传则使用默认值
  4. **可变位置参数 *args**:接收任意多个位置实参,打包成元组 tuple
  5. **可变关键字参数 **kwargs**:接收任意多个关键字实参,打包成字典 dict
  6. **仅限位置形参 /**:/ 左边只能用位置传参,不能关键字传参
  7. **仅限关键字形参 ***:* 右边只能用关键字传参,不能位置传参

1. 位置参数

规则:实参顺序必须和形参一一对应,数量一致

deffunc(a, b, c):
    print(f"a={a}, b={b}, c={c}")

# 正确:位置传参
func(102030)

# 错误:参数数量不匹配
# func(1,2)
# func(1,2,3,4)

2. 关键字参数

规则:不需要顺序,使用 形参名=值;不能位置传参后再乱序关键字

deffunc(a, b, c):
    print(f"a={a}, b={b}, c={c}")

func(a=1, b=2, c=3)
func(c=9, a=7, b=8)  # 顺序随意

# ✅ 混合使用:位置参数必须放在关键字参数前面
func(5, b=6, c=7)

# ❌ 报错:关键字参数不能出现在位置参数前面
# func(a=1, 2, 3)

3. 默认参数(高频坑!)

基础用法

deffunc(a, b=100):
    print(a + b)

func(10)      # b 使用默认 100 → 110
func(1020)  # 传入实参覆盖默认值 → 30

⚠️ 经典大坑:默认参数不要使用可变对象(list/dict)

# 错误示范!不要这样写
defbad_func(item, lst=[]):
    lst.append(item)
    print(lst)

bad_func(1)   # [1]
bad_func(2)   # [1,2]  意外累加!列表只会创建一次

# ✅ 正确写法:默认值设为 None,函数内部初始化可变对象
defgood_func(item, lst=None):
if lst isNone:
        lst = []
    lst.append(item)
    print(lst)

good_func(1)  # [1]
good_func(2)  # [2]

4. 可变位置参数 *args

收集多余位置实参,得到元组

deffunc(a, *args):
    print(f"a = {a}")
    print(f"args = {args}, type={type(args)}")

func(1)
func(10203040)

# 元组解包传入 *
nums = (123)
func(0, *nums)

输出:

a = 1
args = (), type=<class 'tuple'>
a = 10
args = (20, 30, 40), type=<class 'tuple'>
a = 0
args = (1, 2, 3), type=<class 'tuple'>

5. 可变关键字参数 **kwargs

收集多余关键字实参,得到字典

deffunc(a, **kwargs):
    print(f"a={a}")
    print(f"kwargs={kwargs}, type={type(kwargs)}")

func(10, name="张三", age=18)

# 字典解包 **
info = {"sex""男""height"180}
func(50, **info)

6. *args + **kwargs 组合(万能参数)

接收任意参数,通用封装常用

defall_param_func(*args, **kwargs):
    print("位置参数元组:", args)
    print("关键字参数字典:", kwargs)

all_param_func(123)
all_param_func(x=100, y=200)
all_param_func(1020, name="test", num=66)

7. 参数完整顺序规范(必须遵守!)

标准顺序位置形参 → 默认参数 → *args → 仅限关键字参数 → **kwargs

# 合法顺序
defdemo(a, b=10, *args, c, d=99, **kwargs):
    print(a, b, args, c, d, kwargs)

# c 必须使用关键字传参
demo(1234, c=5, d=6, name="demo")

# ❌ 非法顺序示例
# def demo(*args, a, b=10):
# def demo(**kwargs, *args):

8. 仅限位置参数 /(Python3.8+)

/ 左侧形参只允许位置传参,不能关键字传参

deffunc(a, b, /, c):
    print(a, b, c)

func(123)          # ok
func(12, c=30)       # ok

# ❌ 报错 a、b 不能关键字传参
# func(a=1, b=2, c=3)

9. 仅限关键字参数 *

* 右侧形参必须使用关键字传参

deffunc(a, *, b, c):
    print(a, b, c)

func(10, b=20, c=30)
# ❌ func(10, 20, 30) 报错

10. 终极混合完整版示例(综合所有参数)

deffull_demo(a, b=5, /, arg1, *args, kw1, kw2=100, **kwargs):
    print(f"a={a}, b={b}")
    print(f"arg1={arg1}, args={args}")
    print(f"kw1={kw1}, kw2={kw2}")
    print(f"kwargs={kwargs}\n")


full_demo(12102030, kw1=88, kw2=99, city="西安")
full_demo(679, kw1=77, hobby="coding")

📝 课后练习题(带参考答案)

练习1

编写函数 calc_sum,接收任意多个数字,返回总和

# 参考答案
defcalc_sum(*args):
return sum(args)

print(calc_sum(1,2,3))
print(calc_sum(10,20,30,40))

练习2

编写函数 user_info,必填参数 name,可选参数 age(默认None),接收任意多关键字信息,打印所有信息

defuser_info(name, age=None, **kwargs):
    print(f"姓名:{name}, 年龄:{age}")
    print("其他信息:", kwargs)

user_info("小明"19, sex="男", grade="大一")
user_info("小红")

练习3 判断下面代码会不会报错,说出原因

deftest(x, *args, y, **kwargs):
pass
# test(1,2,3,4)

答案:报错。y是仅限关键字参数,调用时没有传入y

练习4 改错:修复下面默认参数bug

defadd_num(n, res=[]):
    res.append(n)
return res
print(add_num(1))
print(add_num(2))
参考答案
defadd_num(n, res=None):
if res isNone:
        res = []
    res.append(n)
return res
print(add_num(1))
print(add_num(2))

拓展知识点:实参解包

deffunc(a,b,c):
    print(a,b,c)

lst = [11,22,33]
func(*lst)  # 列表解包 → 位置参数

dic = {"a":100"b":200"c":300}
func(**dic) # 字典解包 → 关键字参数

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  1. CONNECT:[ UseTime:0.001052s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001425s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002442s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002495s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001477s ]
  6. SELECT * FROM `set` [ RunTime:0.000621s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001570s ]
  8. SELECT * FROM `article` WHERE `id` = 507883 LIMIT 1 [ RunTime:0.001001s ]
  9. UPDATE `article` SET `lasttime` = 1787316783 WHERE `id` = 507883 [ RunTime:0.004671s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000621s ]
  11. SELECT * FROM `article` WHERE `id` < 507883 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001103s ]
  12. SELECT * FROM `article` WHERE `id` > 507883 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001061s ]
  13. SELECT * FROM `article` WHERE `id` < 507883 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001934s ]
  14. SELECT * FROM `article` WHERE `id` < 507883 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003121s ]
  15. SELECT * FROM `article` WHERE `id` < 507883 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.032520s ]
0.223958s