9. How is everybody doing?


#1

https://www.codecademy.com/courses/python-beginner-en-qzsCL/1/5?curriculum_id=4f89dab3d788890003000096

The instructions of this exercise are:

  1. Finally, print out the result of calling get_class_average with your students list. Your students should be [lloyd, alice, tyler].

  2. Then, print the result of get_letter_grade for the class's average.

The error messages are these:

Traceback (most recent call last):
File "python", line 56, in
File "python", line 53, in get_class_average
File "python", line 28, in get_average
TypeError: string indices must be integers, not str

I didn't convert the variables to string, and even if I put a str(variable), it shows as an invalid syntax. Please anybody can help me to fix this?


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)
    result = total / len(numbers)
    return result
    
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    homework = 0.1*homework #retirar parenteses
    quizzes = 0.3*quizzes
    tests = 0.6*tests
    media = sum([homework, quizzes, tests])
    return media
    
def get_letter_grade(score):
    #score = get_average(student)
    if score >= 90.0:
        return "A"
    elif score >= 80.0:
        return "B"
    elif score >= 70.0:
        return "C"
    elif score >= 60.0:
        return "D"
    else:
        return "F"

def get_class_average(students):
    results = []
    for student in students:
        get = get_average(student)
        results.append(get)
    return average(results)
print get_class_average(lloyd)
print get_class_average(alice)
print get_class_average(tyler)
print get_letter_grade(get_average())Replace this line with your code.


#2

where is your students list from 3. put it together?

then you can call get_class_average() with students list as arguments

this will give you the average grade for the class, then you can use get_letter_grade to convert this class average grade, into a letter class average grade


#3

I'm sorry, I didn't understand "where is your students list from 3. put it together?"

could you write an example of what you are explaining?

Thank you


#4

put it together is one of the exercises you completed in this track (link), in this you build a list. You are going to need this list. You can use it as argument for get_class_average


#5

Great! It works now.

You are the best!

Thank you!!!


#6