I'm on exercise 8. Part of the Whole

Below my code is correct, but I don't understand why it works for

print get_class_average(students)

but gives error for something else in argument? I don't have any row, where I defined what students are, there is no "students" written at all. I intentionally did it studentss in get_class_average. How it knows that students in argument means lloyd, alice and tyler? My question is why it works for print get_class_average(students)? Was it defined outside of code?

```
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]
}
# Add your function below!
def average(numbers):
total = float(sum(numbers))/len(numbers)
return total
def get_average(student):
homework=average(student["homework"])
quizzes=average(student["quizzes"])
tests=average(student["tests"])
w_ave=homework*0.1+quizzes*0.3+tests*0.6
return w_ave
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(studentss):
results=[]
for studentt in studentss:
results.append(get_average(student))
return average(results)
print get_class_average(students)
```