fib_argparse.py

import argparse

def fib(n):
    a, b = 0,1
    for i in range(n):
        a, b = b, a+b
    return a


def Main():
    parser = argparse.ArgumentParser()
    group = parser.add_mutually_exclusive_group()
    group.add_argument("-v", "--verbose", action="store_true")
    group.add_argument("-q", "--quiet", action="store_true")
    parser.add_argument("num", help=" The fibonacci seereses you want \
                to calculate", type=int)
    parser.add_argument("-o", "--output", help="This is for output",\
            action="store_true")
    args = parser.parse_args()
    result = fib(args.num)

    if args.verbose:
        print("The "+str(args.num)+"the fib number is "+str(result))
    elif args.quiet:
        print(result)
    else:
        print("Fib("+str(args.num)+") = "+str(result)+"")

    if args.output:

        f = open("abc.txt", "a")

        f.write(str(result)+'\n')

if __name__ == '__main__':
     Main()