Python Assignment Calculator Beta

#funtions being defined
def add(x,y):
    return x + y

def divide(x,y):
    return x / y

def average(x,y):
    return (x + y) / len(num_assignments)

def multiply(x,y):
    return x * y

#Add the nth value to the value of the numeric value
def ordinal(n):
    return "%d%s" % (n,"tsnrhtdd"[(n//10%10!=1)*(n%10<4)*n%10::4])

#variables list
html_link = 'https://upchieve.org/students/'
num_assignments = float(input('How many assignments have been completed in the class so far?'))
assignment_grades = []
assignment_totals = []

# 1st Loop 
for i in range(0,int(num_assignments),1):
    grade = float(input(f'Enter The grade received on the {ordinal(i + 1)} assignment:'))
    total = float(input(f'Enter the total points possible for the {ordinal(i + 1)} assignment:'))
    assignment_grades.append(grade)
    assignment_totals.append(total)

assignment_totals_received = sum(assignment_grades)
assignment_totals_possible = sum(assignment_totals)

assignment_average = divide(assignment_totals_received, num_assignments)
assignment_total_average = divide(assignment_totals_possible, num_assignments)

assignment_start_percent = divide(assignment_totals_received, assignment_totals_possible)
assignment_percent = multiply(assignment_start_percent, 100)

#print statement
print('You have completed {:.0f} so far in this course.'.format(num_assignments))
print('The average for the {:.0f} assignments is {:.0f} points, out of an average total of {:.0f} points.'.format(num_assignments, assignment_average, assignment_total_average))
print('The total points received on the {:.0f} assignments is {:.0f} points, out of the {:.0f} points possible.'.format(num_assignments, assignment_totals_received, assignment_totals_possible))

#if-else statement with print() parameter
if assignment_percent >= 90:
    print('You passed with flying colors obtaining a {:.0f}%. Keep up the good work.'.format(assignment_percent))

elif assignment_percent < 90 and assignment_percent >= 80:
    print('You did really good, getting an {:.0f}%. If you wish to make an A, check out this site in your free time: {}'.format(assignment_percent, html_link))
elif assignment_percent < 80 and assignment_percent >= 70:
    print('You did better than some, but some did better than you. You got a {:.0f}%. Perhaps you should make some time to go to: {} '.format(assignment_percent, html_link))

elif assignment_percent < 70 and assignment_percent >=60:
    print('You did pass the assignments, but you could have done better. You got a {:.0f}%. You should probably visit {}.'.format(assignment_percent, html_link))

else:
    print('You obtained only {:.0f}%. A tutor could be helpful for your future assignments. Here is a website for you to consider: {}'.format(assignment_percent, html_link))