```
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)
return total
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
def get_letter_grade(score):
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)
print get_letter_grade(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?

(Grade B is correct)