'else' statement not executing

[buran]

Change

main_opt = ['opt1', 'opt2', 'opt3']

to

main_opt = [opt1, opt2, opt3]

and

main_opt[choice - 1] + '()'

to

main_opt[choice - 1]()

your code

main_opt[choice - 1] + '()'

just creates a string that you don't use at all -i.e. you don't assign it to a variable.

Of course you can always do

eval(main_opt[choice - 1] + '()')

Actually, I would do

#!/usr/bin/env/python3

def opt1():
   print("in opt 1")
   return


def opt2():
   print("in opt 2")
   return


def opt3():
   print("in opt 3")
   return


def main_mnu():
   print('This is the Main Menu. Please make a selection.')
   print('    1) opt1')
   print('    2) opt2')
   print('    3) opt3')

   main_opt = {'1':opt1, '2':opt2, '3':opt3}

   while True:
       choice = input('Enter choice: ')
       try:
            main_opt[choice]()
            break
       except KeyError as err:
            print('Not an option, try again.', err)


if __name__ == '__main__':
   main_mnu()