我们可以使用外部函数在python中访问外部函数范围之外的内部函数吗? [英] Can we access inner function outside its scope of outer function in python using outer function?

问题描述

出于好奇，我想知道这一点.
我知道内部函数的作用域仅限于外部函数体，但是仍然有什么方法可以使我们可以在其作用域之外访问内部函数变量或在其作用域之外调用内部函数?

Just for the sake of curiosity I wanna know this..
I know scope of inner function is limited to outer function body only, but still is there any way so that we can access the inner function variable outside its scope or call the inner function outside its scope ?

In [7]: def main():
   ...:     def sub():
   ...:         a=5
   ...:         print a
   ...:         

In [8]: main()

In [9]: main.sub()
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/home/dubizzle/webapps/django/dubizzle/<ipython-input-9-3920726955bd> in <module>()
----> 1 main.sub()

AttributeError: 'function' object has no attribute 'sub'

In [10]: 

推荐答案

>>> def main():
...     def sub():
...         a=5
...         print a
... 
>>> main.__code__.co_consts
(None, <code object sub at 0x2111ad0, file "<stdin>", line 2>)
>>> exec main.__code__.co_consts[1]
5

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