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列表和字典的解构|Python自学成才(番外篇4)

  • 2026-06-30 09:54:33
列表和字典的解构|Python自学成才(番外篇4)

Python自学成才(番外篇4)|列表和字典的解构

在前面讲函数的内容中,我们提到了用 *args和 **kwargs的方式来解构数据:Python学习笔记——从入门到报废(十三、函数(下))

通常它们会写在函数的形参当中:

def function(*args, **kwargs):pass

在这里,* 不是乘法、也不是幂运算,而是结构赋值,通常用来解压提取列表 list、元组 tuple、字典 dict 中的数据。

之前我们简单提到了它们的作用和用法,今天我们单开一篇详细说说。

什么是解构

解构 = 拆开打包好的数据。

把列表、元组、字典看作一个压缩包,单星号、双星号就是解压软件,把里面的存的内容单独提取出来:

  • * 单星号:用来拆解序列(列表、元组、字符串)
  • ** 双星号:专门拆解字典,得到键值对结果

单星号 * 解构序列数据

直接对 list 进行解构

如果普通打印输出列表,会自带中括号和逗号;而使用单星号可以只输出内部元素,抛弃标点,美化输出形式:

# 原始写法:带括号,格式难看lst = [102030]print(lst)# Output: [10, 20, 30]# 单星号解构:直接拆开元素print(*lst)# Output: 10 20 30

多变量拆分

我们在写代码时,会遇到用如下的方式解构右侧内容,并赋值到左侧多个变量的时候:

var1, var2, var3 = function()var1, var2 = my_list

如果我们不确定右侧到底有多少元素能被拆分赋值,那么上述写法就很容易报错。

通常报错翻译过来就是,右侧有多个元素,但左侧被复制的变量数量小于右侧元素的数量

但是搭配星号就能灵活收纳剩余的元素:

name_list = [12345]# 前两个固定取值,剩下全部存入resta, b, *rest = name_listprint(a)# Output: 1print(b)# Output: 2print(rest, type(rest))# Output: [3, 4, 5] <class 'list'>

注意这里使用星号解构出来的 rest 的数据类型为 list。

但是如果我们想对右侧的收尾元素解构赋值,还能用这种方法吗?答案是可以

进一步,用星号进行多变量解构拆分并赋值,不一定要在左侧的最后位置。可以在左侧开头、中间、末尾的任意位置。

num = [123456]# 取第一个、最后一个,中间全部忽略first, *mid, last = numprint(first, mid, last)# Output: 1 [2, 3, 4, 5] 6

列表拼接

如果我们想往一个 list 里添加内容或合并多个列表,常用的是用 extend() 或者 append() 函数。但是,使用星号解构的方式,也能便捷实现:

lst1 = [123]lst2 = [456]lst3 = [789]new_lst = [*lst1, *lst2, *lst3]print(new_lst)# Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]

💡 原理就相当于是用星号解构所有元素后,重新生成一个新的列表。

字符串和元组也能用此方式解构

单星号不局限于解构列表,字符串和元组也能完成解构操作:

s = "python"a, *b = sprint(a, b)# Output: p ['y', 't', 'h', 'o', 'n']t = (100200300)print(*t)# Output: 100 200 300

双星号 ** 解构键值对数据

首先要明确,双星号只能解构字典,同时不能用 print(**dict) 的形式打印输出,只能用于进行赋值或合并操作。

字典合并

字典可以用 update() 合并,缺点是会改动原字典;而双星号合并不会修改原数据:

user1 = {"name""Godess""age"18}user2 = {"gender""female""height"170}new_user = {**user1, **user2}print(new_user)# Output: {'name': 'Godess', 'age': 18, 'gender': 'female', 'height': 170}# 使用 update 合并,会改动原 user1 的内容user1.update(user2)print(user1)# Output: {'name': 'Godess', 'age': 18, 'gender': 'female', 'height': 170}

重复 key 的覆盖规则

如果两个字典存在相同键,后面字典的键值重复项会覆盖前面字典:

d1 = {"name""张三""age"18}d2 = {"name""李四"}new_d = {**d1, **d2}print(new_d)# Output: {'name': '李四', 'age': 18}

双星号解构函数传参

除了用来解构字典外,还可以用于对函数进行传参:

def function1(**kwargs):print(kwargs)function1(name="张三", age=18)# Output: {'name': '张三', 'age': 18}def function2(weight, height):print(f"体重:{weight},身高:{height}")kwargs = {"weight"70"height"1.7}function2(**kwargs)# Output: 体重:70,身高:1.7
  • 当我们不确定函数需要接受什么参数时,或者需要一定传参自由度时,我们就可以在函数定义时设置双星号解构的形参,用于应对函数调用者的个性化输入。在函数内部,这个解构变量则以字典的形式存在。
  • 当我们不想对其函数形参输入顺序时,我们可以直接定义一个字典,键是形参的名称,值时需要传给函数的内容,然后以解构的形式将字典传给函数,函数会自动进行变量名称的对齐。

注意事项

  • 单星号解压字典,只能拿到 key,拿不到 value
  • 单星号解构的数据一定是列表
  • 双星号不能单独打印输出,只能用于大括号内合并
  • 一个多变量赋值语句中,只能有一个星号变量,否则出错 (想想是为什么?)

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  1. CONNECT:[ UseTime:0.000979s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001248s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000647s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000603s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000984s ]
  6. SELECT * FROM `set` [ RunTime:0.000477s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001140s ]
  8. SELECT * FROM `article` WHERE `id` = 500066 LIMIT 1 [ RunTime:0.000750s ]
  9. UPDATE `article` SET `lasttime` = 1783022439 WHERE `id` = 500066 [ RunTime:0.038837s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000667s ]
  11. SELECT * FROM `article` WHERE `id` < 500066 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002470s ]
  12. SELECT * FROM `article` WHERE `id` > 500066 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000935s ]
  13. SELECT * FROM `article` WHERE `id` < 500066 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001835s ]
  14. SELECT * FROM `article` WHERE `id` < 500066 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002514s ]
  15. SELECT * FROM `article` WHERE `id` < 500066 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018931s ]
0.215383s