Python searches for Variables not only in local or global scoop but also
in __builtins__. If you do something like __builtins__.os = os, than
this variable should be accessible global.
If you then write something like:
def B():
os.stat("/")
import os
Python recognises on compile time, that os is a local variable in B and
allocates memory for it. All reading or writing now goes to the local
variable and not the one in __builtins__. And the local variable has
never been assigned to a value and an Exception is thrown.
Best
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