Python：将值存储在系统变量中？

我被指派在python中执行一项任务，必须“将一个表达式存储到系统变量

\uuuuu return\uuuu

”，然后在另一个函数中返回

\uuuuu return\uuu

的值

我理解什么是

\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

我是否应该要求对该主题进行进一步的澄清，或者是否有办法做到这一点？
系统变量是一个全局变量，可以从系统的任何位置访问

例如，在Windows中，您可以通过按Winkey，然后搜索“编辑系统环境变量”，然后单击“环境变量”来查看系统变量。。。按钮
（注意：在Windows中，用户和整个系统可以有单独的变量）

在Linux中，终端中的
printenv
将打印环境变量

回到Python：
您可以使用

import os
os.environ['__return__'] = some_expression

并使用

def foo():
    return os.environ['__return__']

我不清楚，如果我们谈论的是pdb调试的“\uuuuu return\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu