Collecting Average User Statistics? 1st semester programmer

[scidam]

Getting the average credits and average study hours, I assume I would use a for loop.

I didn't understand: why do you need to use a for-loop. You have the number of students and total value of credits. Mean value is a fraction of the total amount of credits and the number of students, isn't it?

I would also suggest some refactorings, e.g.

# define a dict

grade_mapper = {'a': 15,
                'b': 12,
                'c': 9,
                etc... }
# you can rewrite if/elif-series as follows:

study_hours = grade_mapper.get(desiredGrade.lower(), None)  # I leave camel-case just for clarity
if study_hours is None:
    print("Invalid grade")

Also, you can convert variables to lowercase in if-conditions, e.g.
Instead of coding

if some_var == 'a' or some_var == 'A':
    ...

you can do:

if some_var.lower() == 'a':
   ...