[Python] How to make script-level variables private to the script

Is it possible to declare a global variable that is invisible to the importing script?

For example, in script a.py I have a variable var_a that is accessible to any function in a.py. However, in script b.py that imports a.py, I want var_a to be inaccessible.

(A somewhat similar concept to C's static module variables)

In a.py:

var_a = "hello"

print("In script a.py:", var_a)


In b.py:

from a import var_a

print("In script b.py:", var_a)


Testing:

$ python3 b.py
In script a.py: hello
In script b.py: hello


I would like to get an error when referencing var_a from b.py.

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