Why is the list students = [lloyd, tyler, alice] unnecessary?

#1

This code works weather I have the list students = [] or not. Without the list, how does the code know to run through all the dictionaries?

``````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):
for number in numbers:
total = float(sum(numbers))
total = total/len(numbers)

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)

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:
get_average(student)
results.append(get_average(student))
return average(results)

print get_class_average(students)

#2

It knows to run through a dictionary you call with the function you've created.

For instance:

`get_letter_grade(lloyd)`

Hope this helps!

#3

In the final print get_letter_grade(get_class_average(students)) I do not call a list of students but the code comes up with a B from averaging Lloyd, Alice and Tyler but the code knows to pull from all three libraries. How is this?

#4

True, that's fantastically amazing.

I didn't see you do this in your code as in the instruction `students = [lloyd, alice, tyler]` and yet gives that.

A bug I might want to guess or you might have done so and it's still reading that you did so before.

#5

true it work but i dont know whats is going on , i wrote the same code (be my own hand) and it keep telingme that it an error pop that the type ([alice]) supused to be int not srt.
but wene i copy and paset it works

#6

Uhm.. Maybe indentation or something you might be seeing yourself.

You're welcome.

Have fun coding!