So I'm not stuck, but I'm not sure I fully understand


#1



It's working just fine but I don't understand why or how python knows that "students" in the last get_class_average function is Lloyd, Alice, and Tyler?


I was expecting I'd have to create a variable "students" and set it equal to lloyd, alice, and tyler.
like so "Students = lloyd, alice, tyler" or a dictionary/list whatever it the proper line of code may be. But I was surprised I didn't need such a line? I'm not sure where in my code lloyd alice and tyler are already defined as students? I hope this makes sense


 
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]
}

def average(numbers):
    total = sum(numbers)
    total = float(total)
    results = total/len(numbers)
    return results 
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"]) 
    return homework * .1 + quizzes * .3 +\
    tests * .60   
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" 
print get_letter_grade(get_average(lloyd)) 
def get_class_average(students):
    results = [] 
    for student in students: 
        results.append(get_average(student))
    return average(results)


#2

Python knows nothing, does as you say.
You're not calling it, so you aren't telling it what the students are.


#3

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