NameError when inputting y/n prompt to end loop

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I am attempting to write a simple Letter Grade Converter that takes an input from 0-100 and returns a letter grade. The End of the while statement asks for a y/n input to continue the conversion or end it. Entering Y seems to always return a name error that y has not been defined.

print("Letter Grade Converter")

choice = "y"
while choice.lower() == "y":
    number = int(input("Enter numerical grade: "))
    if number > 87:
        letter = "A"
    elif number > 79:
        letter = "B"
    elif number > 66:
        letter = "C"
    elif number > 59:
        letter = "D"
    else:
        letter = "F"

    print("Letter Grade: " + letter)
    choice = input("Continue (y/n)?: ")
print ("Bye!")

I have already defined choice in the beginning, is that what is causing a name error??

asked Feb 13 '18 at 19:15

Shaun Zinckgraf

So what's the full traceback for the error? – Martijn Pieters Feb 13 '18 at 19:17
And is this Python 2 perhaps? – Martijn Pieters Feb 13 '18 at 19:17
It is python 2.7 i believe – Shaun Zinckgraf Feb 13 '18 at 19:19
The traceback is: File "C:\PythonPrograms\Grade.py", line 3, in while choice.lower() == "y": NameError: name "choice" is not defined – Shaun Zinckgraf Feb 13 '18 at 19:21
The name error you are getting can’t actually be caused by the code posted; that would only happen if the `choice = "y"` line before it was missing. Note the line number, in the code posted here your `while` is on line 4 instead. – Martijn Pieters Feb 13 '18 at 19:50

NameError when inputting y/n prompt to end loop

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