Is it possible to distinguish between system environment variables and the user ones?

[could ildg]

To a environment variable in Windows, can python know if it is a
system environment
variable or a current-user environment variable?
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鹦鹉聪明绝顶、搞笑之极，是人类的好朋友。
直到有一天，我才发觉，我是鹦鹉。
我是翻墙的鹦鹉。