How to solve unhandled NameError in Python

Question

So while running the codes on the following error is generated. It says that the NameError is left unhandled by the user code.

The error:

Traceback (most recent call last):
File "D:\3rd sem\Object Oriented Programming\Lab\VS\PythonApplication1\PythonApplication1\PythonApplication1.py", line 50, in <module>
main()
File "D:\3rd sem\Object Oriented Programming\Lab\VS\PythonApplication1\PythonApplication1\PythonApplication1.py", line 10, in main

grade=str(input("Enter the grade: "))
File "<string>", line 1, in <module>
NameError: name 'a' is not defined

The code goes like this:

classnum=int(input("Enter the num of classes: "))

def main():
totalcredit=0
totalgpa=0

for i in range(1,classnum+1):
    print "class", i
    credit=int(input("Enter the credit: "))
    grade=str(input("Enter the grade: "))
    totalgpa+=coursePoints(credit,grade)
    totalcredit+=credit

totalcourse=classnum 
semestergpa=totalgpa/totalcredit
print("Semester summary")
print("courses taken: ", classnum)
print("credits taken: ", totalcredit)
print("GPA points: ", totalgpa)
print("Semester GPA: ", semestergpa)

def coursePoints(Credit,Grade):
    if Grade == 'A+' or Grade == 'a+':
        return 4*Credit
    elif Grade == 'A' or Grade == 'a':
        return 4*Credit
    elif Grade == 'A-' or Grade == 'a-':
        return 3.67*Credit
    elif Grade == 'B+' or Grade == 'b+':
        return 3.33*Credit
    elif Grade == 'B' or Grade =='b':
        return 3*Credit
    elif Grade == 'B-' or Grade == 'b-':
        return 2.67*Credit
    elif Grade == 'C+' or Grade == 'c+':
        return 2.33*Credit
    elif Grade == 'C' or Grade == 'c':
        return 2*Credit               
    elif Grade == 'C-' or Grade == 'c-':                        
        return 1.67*Credit                
    elif Grade =='D+' or Grade == 'd+':                      
        return 1.33*Credit                
    elif Grade == 'D' or Grade == 'd':                        
        return 1*Credit                      
    elif Grade == 'D-' or Grade == 'd-':                                
        return 0.33*Credit                     
    else:
        return 0

main()

Can anyone help for solutions.

Thanks in advance.

score 1 · Answer 1 · answered Mar 06 '16 at 20:48

1

You seem to be using Python 2.x, so you should change

grade=str(input("Enter the grade: "))

To

grade = raw_input("Enter the grade: ")

answered Mar 06 '16 at 20:48

Cory Kramer

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1

@Pa-wonSunuwar Stack Overflow is not really designed for back-and-forth discussion. It is set up for small specific questions and answers. If you have a new question, please create a new post. However, that being said I suggest you google "python variable referenced before assignment" before making a new question, because this is a common mistake. – Cory Kramer Mar 06 '16 at 20:52
Thank you all for your suggestions – Pa-won Mar 06 '16 at 20:53

How to solve unhandled NameError in Python

1 Answers1