# Student Becomes the Teacher (Codecademy Python tutorial)(8/9)

#1
``````lloyd = {
"name": "Lloyd",
"homework": [],
"quizzes": [],
"tests": []
}
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]
}

lloyd["homework"] = [90.0,97.0,75.0,92.0]
lloyd["quizzes"]=[88.0,40.0,94.0]
lloyd["tests"]=[75.0,90.0]

students  = [lloyd,alice,tyler]
print students

for student in students:
print student["name"]
print student["homework"]
print student["quizzes"]
print student["tests"]
print

def average(numbers):
total = float(sum(numbers))
total /= len(numbers)

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
a = 0.1 * homework + 0.3*quizzes + 0.6*tests
return a

if score >= 90:
return "A"
elif score < 90 and score >=80:
return "B"
elif score < 80 and score >=70:
return "C"
elif score < 70 and score >=60:
return "D"
else:
return "F"

b =  get_average(lloyd)
``````

### problem - if i call get_letter_grade(lloyd), i get A

however if i first get lloyds average and set it equal to the avergae b, in that case the grade chnages to B.
why does this happen?

#2

`get_letter_grade` only purpose in life is to convert number grade to letter grade, but if we look at your function call:

``````print get_letter_grade(lloyd)
``````

you pass a dictionary (`lloyd`) as argument, your `get_letter_grade` function is not build to handle a dictionary

#3

So what should i do then?

#4

That is the question, i on purpose left that open for you to figure out. What do you think you should do?

#5

leave python.
just kidding.
imma think.

#6

the thing is if i first get the average and then use the average to get the grade, the code seems lathargic, unoraganised and un-necessarily unoptimised.

#7

Doesnâ€™t have to be the case, sometimes you might only want the number grade (calculated by get_average) while other times you want the letter grade. Which is why we need separate functions

this comes together nicely in the next exercise where you build the get_class_average function, you will see.

#8

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