Part of the Whole


#1



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


My code does NOT work if I type "for i in students:". It works if I type "for student in students:". Why is that?

The error message I am getting is: "Oops, try again. get_class_average([alice]) resulted in an error: global name 'student' is not defined"


I expect it to work with this too - "for i in students:"


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)
    return total / len(numbers)
    
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    result = 0.1 * homework + 0.3 * quizzes + 0.6 * tests
    return result
    
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))

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


#2

for student in students:   
        results.append(get_average(student))

This works because each item in the students list is transferred to student which is then used to get_average(student)

for i in students:
    results.append(get_average(student))

However, this doesn't work because now each in the students list is transferred to i and i is never used. You still have results.append(get_average(student)) but student is never defined in the function.
If you were to change it to this:

for i in students:
    results.append(get_average(i))

This will work as intended.

Hope this helps! If not, feel free to leave a reply and I'll try to go more in-depth.


#3

Understood. Thanks!

It works now.


#4

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