Understanding - Advanced, exercise 12

Text

The variable my_gn contains the string of a given name in lowercase and without any space (e.g. "johnhenry"), the variable my_fn contains the string of a family name in lowercase and without any space (e.g. "doe"), and the variable my_mn contains the string of ten 0-9 digits. Study the execution of the following functions when they are called as follows: test(my_gn, my_fn, my_mn).

def test(gn, fn, mn):
    result = 0

    c_gn = cnt(gn)
    c_fn = cnt(fn)

    for c in c_gn:
        if c in c_fn:
            result = result + (c_gn[c] - c_fn[c])

    idx = (len(gn) + len(fn)) % len(mn)
    return result * (int(mn[idx]) + 1)


def cnt(s):
    result = dict()

    for c in s:
        if c not in result:
            result[c] = 0
        result[c] = result[c] + 1

    return result

Hints

The function test considers how many characters are in the two input names, and how many of them are in commons. Then, using the input digits, it returns a value calculated by using all the three input data.

Additional material

The runnable Python file is available online. You can run it executing the command python exercise_12.py in a shell, and then following the instructions on screen to specify the intended input.