def add_one(the_list):
    """Adds 1 to every element in a list of all numbers
    (either floats or ints)"""
    size = len(the_list)
    for k in list(range(size)):
        the_list[k] = the_list[k]+1

grades = [8,9,10,5,9,10]
print("Initial grades are: "+str(grades))
add_one(grades)
print("Inflated grades are: "+str(grades))