Checking a lists for values to see if they exist

Question

I have this code that's pretty obviously a GPA calculator but its only a weighted GPA calculator. When I test the code it works fine with the values

[A, B, C, D, F]

But when I want to test it with values such as

[A+, B, B-, Z]

I don't know how to account for the grades that are not actually in the list. I need the code to return None if it is tested with such letters. I have tried using "if" to do it like I did with

if grades == []: return None if credit_worth ==[]: return None

But I just cant get it, here is the rest of the code:

def gpa_calculator(grades, credit_worth): gpa_value = {'A': 4.0,'B': 3.0,'C': 2.0,'D': 1.0,'F': 0.0, 'a': 4.0, 'b': 3.0, 'c': 2.0, 'd': 1.0, 'f': 0.0} total_credits = 0 if grades == []: return None if credit_worth == []: return None for grade, credit in zip(grades, credit_worth): total_credits += gpa_value[grade] * credit GPA = total_credits / sum(credit_worth) return GPA

ShreyasG · Accepted Answer · 2017-09-29 15:34:08Z

2

Add this line in the for loop:

if grade not in gpa_value.keys(): return None

answered Sep 29, 2017 at 15:34

ShreyasG

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3 Comments

harderthanithought Over a year ago

is there another way to do it, I have not learned .keys yet?

ShreyasG Over a year ago

.keys() is a standard dict method to fetch the list of keys in your dictionary. Any reason why you don't want to use it?

harderthanithought Over a year ago

Not really, I just prefer to use code I know so I don't get confused. But you just explained it to my so I'm good. Thank you.

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