9/9 - How is everybody doing


#1

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 = sum(numbers)
total = float(total)
average = total / len(numbers)
return average

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
return total

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))

students = ["lloyd", "tyler", "alice"]

def get_class_average(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)

print get_class_average(students)
print get_letter_grade(get_class_average(students))

I am getting an error saying TypeError: string indices must be integers, not str. Does anyone know what is wrong?


#2

Nevermind, I figured it out. I have to define students in the list as variables, not strings. It works now


#3

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(numb):
return float(sum(numb)) / len(numb)

def get_average(student):
homework = sum(student["homework"]) / len(student["homework"])
#print "Quizzes \n"
quizzes = sum(student["quizzes"]) / len(student["quizzes"])
#print sum(student["quizzes"]), len(student["quizzes"])
#print "tests \n"
tests = sum(student["tests"]) / len(student["tests"])
avg = 0.10 * homework + 0.30 * quizzes + 0.60 * tests
return avg

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(students):
results = []
for student in students:
results.append(get_average(student))
return average(results)

print get_class_average([lloyd, alice, tyler])
r = get_class_average([lloyd, alice, tyler])
print get_letter_grade(r)

I'm getting the error " Oops, try again. One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade "

Output :
83.8666666667
B
None


#4

make a variable "students = [lloyd, alice, tyler]" and use it instead of entering the list each time


#5

define ..... students=[lloyd,alice,tyler]...separately...nd thn use it in function


#6

thanks .. it worked but its really interesting that these things also throw up error. does this also happen in a non-tutorial set up for python? anyways thanks a lot


#7

yes because its need to define variable "students = [lloyd, alice, tyler]" BEFORE invoking it in "def get_class_average(students):"

cheers :slightly_smiling: