I need help figuring out the errors in my program. I believe my code is good and (hopefully not too far from being done), Ive just got to get this puppy rolling. The 2 files attached have my menu options in them. They are  determineHours determine_grade and  display_averages_and_totals I have my menu set up like (below), that is my menu word for word, but it keeps saying traceback error "A" is not defined. I am entering A because it is a menu choice but it isnt engaging the menu options. Please help. if __name__ == '__main__':        print('\t\t\tMenu')#main menu         print('A: Determine Hours to Study:')        print('B: Determine Grade:')        print('C: Display Averages and Totals:')        print('D: Quit Program')        ch= input('\nEnter your menu choice:').upper()        choice_option = {#menu options the user gets to choose from               A: determineHours,               B: determine_grade,               C: display_averages_and_totals,               D: quit        }        choice_option[ch]()        print("Thank you for using the Grade Calculator 2.0. Your support allows us to continue making apps you will love. Thank you.")

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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I need help figuring out the errors in my program. I believe my code is good and (hopefully not too far from being done), Ive just got to get this puppy rolling. The 2 files attached have my menu options in them. They are 

determineHours

determine_grade

and 

display_averages_and_totals

I have my menu set up like (below), that is my menu word for word, but it keeps saying traceback error "A" is not defined. I am entering A because it is a menu choice but it isnt engaging the menu options. Please help.

if __name__ == '__main__':
       print('\t\t\tMenu')#main menu 
       print('A: Determine Hours to Study:')
       print('B: Determine Grade:')
       print('C: Display Averages and Totals:')
       print('D: Quit Program')
       ch= input('\nEnter your menu choice:').upper()
       choice_option = {#menu options the user gets to choose from
              A: determineHours,
              B: determine_grade,
              C: display_averages_and_totals,
              D: quit
       }
       choice_option[ch]()

       print("Thank you for using the Grade Calculator 2.0. Your support allows us to continue making apps you will love. Thank you.")

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