Grade_calculator.py

#example of data from 3 students 
lloyd = {
    "name": "Lloyd",
    "homework": [90.0, 97.0, 75.0, 92.0],
    "quizzes": [88.0, 40.0, 94.0],
    "tests": [75.0, 90.0]
}
alice = {
    "name": "Alice",
    "homework": [100.0, 92.0, 98.0, 100.0],
    "quizzes": [82.0, 83.0, 91.0],
    "tests": [89.0, 97.0]
}
tyler = {
    "name": "Tyler",
    "homework": [0.0, 87.0, 75.0, 22.0],
    "quizzes": [0.0, 75.0, 78.0],
    "tests": [100.0, 100.0]
}

# average calculation 
def average(numbers):
    total = sum(numbers)
    total = float(total)
    
    return total / len(numbers)
    
# weighted average based on course outline 
def get_average(student):
    homework = average(student["homework"]) * 0.10
    quizzes= average(student["quizzes"]) * 0.30
    tests= average(student["tests"]) *0.60
    
    return homework + quizzes + tests

# grade conversion from number to letter grades 
def get_letter_grade(score):
    if score >= 90:
        return "A"
    elif score >= 80:
        return "B"
    elif score >= 70:
        return "C"
    elif score >= 60:
        return "D"
    else:
        return "F"

#tester 
print get_letter_grade(get_average(lloyd))

#class average 
def get_class_average(students):
    results = []
    
    for student in students:
        each_student = get_average(student) 
        results.append(each_student)     
    
    return average(results)
    
#tester   
print get_class_average([lloyd, alice, tyler])
print get_letter_grade(get_class_average([lloyd, alice, tyler]))