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+# an app to calculate the 'n'th Fibonacci number as an exercise %0A# by Prasith %0A#-*-coding:utf8;-*-%0A%0Adef main():%0A   %0A    print%0A    print %22This app will calculate the 'n'th Fibonacci number. %22%0A    main2()%0Adef main2():%0A    print%0A    n = int(raw_input(%22Please enter the value of'n': %22))%0A    print%0A    x=1L%0A    y=0L %0A    for i in range((n+1)/2):%0A        x = x + y%0A        y = x + y%0A    if n %25 2 == 0:    %0A        print y%0A        print%0A    else:%0A        print x%0A        print%0A%0A    inp = raw_input(%22to try again type 'y', to exit just press enter: %22)%0A    if inp == 'y':%0A        main2()%0A    else:%0A       print%0A       print %22Goodbye then! %22%0A       print%0Amain()%0A

Create fibonacci.py