python list练习

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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": [0.0,87.0,22.0],"quizzes": [0.0,78.0],"tests": [100.0,100.0]
}

# Add your function below!
def average(numbers):
    total=sum(numbers)
    total=float(total)
    result = total/len(numbers)
    return result
    
def get_average(student):
    homework=average(student["homework"])
    quizzes=average(student["quizzes"])
    tests=average(student["tests"])
    return 0.1*homework + 0.3*quizzes + 0.6*tests

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'

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

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