Question

I am very much new to Python and basically want anything other than d or o to rerun the question? Any help?

Myfile = raw_input( '''Specify filename (o) or use default chain (d)? ''')


if Myfile == 'd':
    print 'default choosen '
    Myfile = 'M:/test/testchains_a.csv'


if Myfile == 'o':
    print 'own file choosen '
    Myfile = raw_input('Enter absolute path to the .csv file:')

else:
    print 'successful'

Answer 1

You can do this the way squiguy suggested, but it might be more readable to put the whole thing into a loop, so you don’t have to repeat the same checks twice:

while True:
    Myfile = raw_input( '''Specify filename (o) or use default chain (d)? ''')

   if Myfile == 'd':
        print 'default choosen '
        Myfile = 'M:/test/testchains_a.csv'
        break

    elif Myfile == 'o':
        print 'own file choosen '
        Myfile = raw_input('Enter absolute path to the .csv file:')
        break

This will loop forever, until it hits a break—in other words, until they select 'd' or 'o'.