gistfile1.py

students = [{
    "name": "Lloyd",
    "homework": [90.0, 97.0, 75.0, 92.0],
    "quizzes": [88.0, 40.0, 94.0],
    "tests": [75.0, 90.0]
},{
    "name": "Alice",
    "homework": [100.0, 92.0, 98.0, 100.0],
    "quizzes": [82.0, 83.0, 91.0],
    "tests": [89.0, 97.0]
},{
    "name": "Tyler",
    "homework": [0.0, 87.0, 75.0, 22.0],
    "quizzes": [0.0, 75.0, 78.0],
    "tests": [100.0, 100.0]
}]


# def get_letter_grade(score):
#     if score >= 90:
#         return "A"
#     elif score >= 80 and score <90:
#         return "B"
#     elif score >= 70 and score <80:
#         return "C"
#     elif score >= 60 and score < 70:
#         return "D"
#     elif score < 60:
#         return "F"
#     else:
#         return "poop"

def average(scores):
    divide = len(scores)
    total = 0.0

    for score in scores:
        total += score

    average = total / float(divide) # added float for more accurate divison
    return average

def get_average(student):
    return (average(student['homework']) * .1) + \
           (average(student['tests']) * .3) + \
           (average(student['quizzes']) *.6)


def get_class_average(students):
    average_grade = 0
    for student in students:
        average_grade += get_average(student)

    return average_grade

print get_class_average(students)