Understanding - Advanced, exercise 37

Text

The variable my_given_name contains the string of a given name in lowercase and without spaces, and the variable my_given_name contains the string of a 10-digit matriculation number (e.g. "0000123456"). What is the value returned by calling the function first as shown as follows: first(my_mat_string, my_given_name).

from collections import deque


def first(mat_string, given_name):
    s = deque()

    for char in mat_string:
        n = int(char)
        if n > 0:
            s.append(n)
    
    return second(s, given_name)


def second(c, gn):
    if len(c) == 0:
        return 0
    else:
        i = c.pop()
        s = gn[(i - 1) % len(gn)]
        if s in "aeiou":
            return 2 + second(c, gn)
        else:
            return -1 + second(c, gn)

Hints

The function first is a function calling a recursive one (i.e. second) passing as input a stack created starting from the matriculation number.

Additional material

The runnable Python file is available online. You can run it executing the command python exercise_37.py in a shell, and then following the instructions on screen to specify the intended input.