What to modify in the program such that ...

[jefsummers]

When you call the ScriptEnv.circle_area() function, you are only calling that particular function in the module, and the input line you have above does not get executed.

I suggest defining a class. Something like this (untested)

class geometry:

    from math import pi
    def __init__(self)
        self.go = False

    def circle_area(r):
        if go:
            return pi * (r ** 2)
 
    def circle_circumference(r):
        if go:
            return 2 * pi * r

Which is then called by

import geometry 
def main(g):
    print("Running the main function")
    radius = float(input("Enter radius: "))
    print("Area =", g.circle_area(radius))
    print("Circumference =", g.circle_circumference(radius))
 
if __name__ == "__main__":
    g = geometry()
    g.go = True
    main(g)

Dunder Main creates the geometry object and sets go to true, and passes the g object to main(). Function calls are then to the g object. If a geometry object is created elsewhere the default value for go is False, and nothing will print out. Malformed calls to the g object will still give error messages, as in the case of not passing a parameter.

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One oops from not testing - need self. in front of the go's in the functions within the class