Understanding - Advanced, exercise 25

Text

The variable my_mat contains the string of the numbers of a 10-digit matriculation number (e.g. "0000123456"), while the variable my_full_name contains string of a full name (i.e. given name plus family name separated by a space) all in lowercase. Study the execution of the following function when it is called as follows: n(my_full_name, my_mat).

def n(f_name, mat):
    chars = []
    first = ""

    for sn in mat:
        if first == "":
            first = sn
        i = int(sn)
        cur = f_name[i % len(mat)]
        chars.append(cur)

    result = "".join(chars)
    if result != "":
        return result[0] + n(result, mat.replace(first, ""))
    else:
        return ""

Hints

The function n is a recursive function, which removes the first character on the matriculation before to recursively call itself in its body.

Additional material

The runnable Python file is available online. You can run it executing the command python exercise_25.py in a shell, and then following the instructions on screen to specify the intended input.