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Python:四种作用域

  • 2026-07-02 02:05:00
Python:四种作用域

在 Python 中,作用域决定了变量的“可见范围”和生命周期。Python 遵循一套非常经典的变量查找规则,也就是常说的**LEGB 规则**

当 Python 遇到一个变量名时,它会按照L → E → G → B的顺序,从内到外依次查找。只要在其中某一层找到了,就会立刻停止查找。

我们可以把这四个层级想象成一个公司的权限管理:

  • L (Local) 局部作用域:相当于你个人的办公桌抽屉,里面的东西只有你自己能用。

  • E (Enclosing) 嵌套作用域:相当于你所在的项目组办公室,组里的文件组员都能看,但别的组(外层函数外部)看不到。

  • G (Global) 全局作用域:相当于公司的公共公告栏,全公司(整个代码文件/模块)的人都能看到。

  • B (Built-in) 内置作用域:相当于国家法律法规,在任何公司、任何地方都默认生效。

L - Local(局部作用域)

这是最内层的作用域。在函数(或 lambda 表达式)内部定义的变量,就属于局部作用域。它们只能在当前函数内部被访问,函数一旦执行完毕,这些变量就会被销毁。

def my_func():   local_var = "我是局部变量" #L    print(local_var)my_func() # 输出: 我是局部变量# print(local_var) # 报错!出了这个函数,没人认识它

E - Enclosing(嵌套/闭包作用域)

这种情况出现在嵌套函数中。如果在一个函数(外层函数)内部又定义了另一个函数(内层函数),那么外层函数的局部变量,对于内层函数来说,就是 Enclosing 作用域。

def outer():   enclosing_var = "我是嵌套变量" # E    def inner():      print(enclosing_var) # 内层函数可以直接读取外层函数的变量    inner()outer() # 输出: 我是嵌套变量

G - Global(全局作用域)

在 Python 脚本文件的最外层(也就是任何函数、类之外)定义的变量,属于全局作用域。它们在整个模块(文件)内都可以被访问。

global_var = "我是全局变量" # Gdef my_func():   print(global_var) # 函数内部可以直接读取全局变量my_func() # 输出: 我是全局变量print(global_var) # 输出: 我是全局变量

B - Built-in(内置作用域)

这是最外层的作用域,由 Python 解释器预先定义好。比如我们常用的printlenintlist等内置函数和异常,它们在任何地方都能直接使用。

# len 就是内置作用域的变量print(len([123])) # 输出: 3

关键字:global

如果你在函数内部直接对一个全局变量进行赋值(比如count = 10),Python 会默认你是在创建一个新的局部变量,而不是修改外面的全局变量。

count = 0def add():    # 这里如果不加 global,Python 会认为你要创建局部变量 count     # 但由于下面做了 += 操作,会引发 UnboundLocalError 报错     global count      count += 1add()print(count) # 输出: 1 (成功修改了全局变量)

关键字: nonlocal

同理,如果在内层函数中想修改外层函数(Enclosing)的变量,必须使用nonlocal关键字声明。

def outer():   num = 10   def inner():     nonlocal num # 声明我要修改的是外层的 num,而不是新建局部变量      num = 20    inner()    print(num) # 输出: 20outer()

总结

  • 查找顺序:永远是 L → E → G → B(由内向外)。

  • 修改规则

    • 读变量:直接用,Python 会自动按LEGB 帮你找。

    • 改全局变量:必须加 global

    • 改嵌套外层变量:必须加 nonlocal

    • 改局部变量:直接改,不用声明。

理解了这套规则,你就能轻松应对 Python 中绝大多数的变量作用域问题了。


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  1. CONNECT:[ UseTime:0.000624s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001034s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000702s ]
  6. SELECT * FROM `set` [ RunTime:0.000273s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000711s ]
  8. SELECT * FROM `article` WHERE `id` = 493830 LIMIT 1 [ RunTime:0.000456s ]
  9. UPDATE `article` SET `lasttime` = 1783043197 WHERE `id` = 493830 [ RunTime:0.026194s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.021402s ]
  11. SELECT * FROM `article` WHERE `id` < 493830 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000772s ]
  12. SELECT * FROM `article` WHERE `id` > 493830 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000737s ]
  13. SELECT * FROM `article` WHERE `id` < 493830 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004225s ]
  14. SELECT * FROM `article` WHERE `id` < 493830 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009060s ]
  15. SELECT * FROM `article` WHERE `id` < 493830 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001572s ]
0.153413s