How is Everybody Doing? Working but say Error!?


#1


Hi Gents,

I need your help in order to continue my training on Python. I stuck on the above mentioned exercise for a not clear reason..at least to me...

Here is link to the exercise I stuck at:

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

Error Message Says:
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


The code run and the output was as follows:

83.8666666667
B
None

Here is the Code


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"])
    return 0.1*homework+0.3*quizzes+0.6*tests

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")
get_letter_grade(get_average(lloyd))

def get_class_average(students):
    results=[]
    for stu in students:
        results.append(get_average(stu))
    return average(results)
    
print get_class_average([alice, lloyd, tyler])
class_grade= get_class_average([alice, lloyd, tyler])
print get_letter_grade(class_grade)


#2

First,
You need a global variable after the dictionaries that stores all the dictionaries,

students = lloyd, alice, tyler]

In doing so you can now write this two lines simply,

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

#3

Thanks Bandit,

The global variable solved the issue, but is it required here only or in Python programming in general..?


#4

In Python, variables that are only referenced inside a function are implicitly global. If a variable is assigned a value anywhere within the function's body, it's assumed to be a local unless explicitly declared as global. :slight_smile:


#5

The scope of objects depends upon how the particular program is designed. This set of exercises is based around having students as a global variable that lists the three student dictionaries, but a program could be designed differently, based upon the programmer's judgment.


#6

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