What I'm trying to do is to takes amount of subjets, then takes raw score accordingly, and return GPA and this function will call checkGradePoint during GPA calculation.
Code:
def checkGradePoint(raw):
if raw>100:
    score = "Error, raw score exceed max score" 
elif raw>80:
    score = "4"
elif raw>70:
    score = "3"
elif raw>60:
    score = "2"
...