Import by module:

    ⏵ ls
    module.py  script.py

    ⏵ cat module.py 
    def foo2():
        print('foo2 called.')
        
    ⏵ cat script.py 
    import module

    def foo1():
        print('foo1 called.')

    foo1()
    module.foo2()

    ⏵ python3 script.py
    foo1 called.
    foo2 called.

Import by name:

    ⏵ cat script.py 
    from module import foo2

    def foo1():
        print('foo1 called.')

    foo1()
    foo2()

    ⏵ python3 script.py
    foo1 called.
    foo2 called.