Python - argparse

import argparse
import sys

def main():
    parseit = argparse.ArgumentParser(description="Log into any of FB, Twitter, Gmail, and Yahoo using <username> and <password>")
    root_group = parseit.add_argument_group()

    creds_group = root_group.add_mutually_exclusive_group(required=True)
    creds_group.add_argument('-b','--ball', action='store_false',help="Log into all accounts")

    file_group = creds_group.add_argument_group()
    file_group.add_argument('-i','--file', type=file, help="Log in with credentials in file with format as 'username:password'")

    inline_creds = creds_group.add_argument_group()
    inline_creds.add_argument("username",help="Username to log in as")
    inline_creds.add_argument("password",help="Password to log in with")

    site_group = root_group.add_mutually_exclusive_group()
    site_group.add_argument('-a','--all', action='store_false',help="Log into all accounts")

    sites_avail = site_group.add_argument_group("Site Set","none")
    sites_avail.add_argument('-t','--twitter', action='store_false',help="Log into Twitter")
    sites_avail.add_argument('-f','--facebook', action='store_false',help="Log into Facebook")
    sites_avail.add_argument('-y','--yahoo', action='store_false',help="Log into Yahoo")
    sites_avail.add_argument('-g','--gmail', action='store_false',help="Log into Gmail")
    parseit.print_help()

    """
    I get this error IndexError: list index out of range
    I found this but the goals of the op is different than mine: https://stackoverflow.com/questions/30499648/python-mutually-exclusive-arguments-complains-about-action-index
    """
if __name__ == "__main__":
        main()