Understanding - Advanced, exercise 30

Text

The variable my_mat contains the string of a 10-digit matriculation number (e.g. "0235145398"), and my_n_char is the number of alphabetic characters (i.e. excluding spaces) of your given name (e.g. for "John" the value of the variable is 4). What is the value returned by calling the function sc as shown as follows: cou(my_mat, my_n_char).

def cou(mat, n_char):
    n_char_in_mat = n_char % len(mat)
    idx = int(mat[n_char_in_mat])

    mat_l = []
    for c in mat:
        mat_l.append(c)

    result = []
    while len(mat_l) > 0:
        jdx = idx % len(mat_l)
        result.append(mat_l[jdx])
        mat_l = mat_l[:jdx]
    
    return result

Hints

The function cou is an iterative function that uses one integer included in the digits of the matriculation number as index to select specific values of the matriculation number itself.

Additional material

The runnable Python file is available online. You can run it executing the command python exercise_30.py in a shell, and then following the instructions on screen to specify the intended input.