code: def get_user_group(user_group):
      
      if isinstance(user_group, tuple):
          return '{0}:{1}'.format(*user_group)
      elif isinstance(user_group, six.integer_types) or ':' not in user_group:
          return '{0}:{0}'.format(user_group)
      return user_group
docs: Formats a user and group in the format ``user:group``, as needed for `chown`. If user_group is a tuple, this is used
      for the fomatting. If a string or integer is given, it will be formatted as ``user:user``. Otherwise the input is
      returned - this method does not perform any more checks.
  
      :param user_group: User name, user id, user and group in format ``user:group``, ``user_id:group_id``, or tuple of
        ``(user, group)``.
      :type user_group: unicode | str | int | tuple
      :return: Formatted string with in the format ``user:group``.
      :rtype: unicode | str