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)
```