class Queue:
    """ Represent a FIFO queue.
    """

    def __init__(self):
        """ (Queue) -> NoneType

        Create and initialize new queue self.
        """
        self._data = []

    def add(self, o):
        """ (Queue, object) -> NoneType

        Add o at the back of this queue.
        """
        self._data.append(o)

    def remove(self):
        """ (Queue) -> object

        Remove and return front object from self.

        >>> q = Queue()
        >>> q.add(3)
        >>> q.add(5)
        >>> q.remove()
        3
        """
        return self._data.pop(0)

    def is_empty(self):
        """(Queue) -> bool

        Return True queue self is empty, False otherwise.

        >>> q = Queue()
        >>> q.add(5)
        >>> q.is_empty()
        False
        >>> q.remove()
        5
        >>> q.is_empty()
        True
        """
        return self._data == []


if __name__ == '__main__':
    import doctest
    doctest.testmod()