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()