Side question: how do you prevent import statements from being imported by "from lib import star"? (Without explicitly mentioning all the stuff that is not import statements).

For example, this is mymod.py:

    import numpy as np

    def f(x): return 2*x

And here it is imported:

    from mymod import *

    f(10) # Works as expected.
    np.sum([10, 20]) # Works, but shouldn't work.