Understanding - Advanced, exercise 41

Text

The variable my_mat_number contains the 10-digit strings of a matriculation number. What is the value returned by calling the function sm as shown as follows: sm(my_mat_number).

def sm(mat):
    new_m = []
    
    for d in mat:
        n_d = (int(d) + 1) % 10
        new_m.append(str(n_d))
    
    i = len(new_m) - 1
    if i > -1:
        return new_m[i] + sm("".join(new_m[:i]))
    else:
        return ""

Hints

The input of the function sm acts in a recursive way when the input has some characters.

Additional material

The runnable Python file is available online. You can run it executing the command python exercise_41.py in a shell, and then following the instructions on screen to specify the intended input.