human
Solve the following python programming problem given the following code:
def add_callbacks(self, callback, errback = None, callback_args = None, callback_kwargs = None, errback_args = None, errback_kwargs = None) : 
    'Add a pair of callables (function or method) to the callback and
        errback chain.

        Keyword arguments:
        callback -- the next chained challback
        errback -- the next chained errback
        callback_args -- list of additional arguments for the callback
        callback_kwargs -- dict of additional arguments for the callback
        errback_args -- list of additional arguments for the errback
        errback_kwargs -- dict of additional arguments for the errback

        In the following example the first callback pairs raises an
        exception that is catched by the errback of the second one and
        processed by the third one.

        >>> def callback(previous):
        ...     \'\'\'Return the previous result.\'\'\'
        ...     return "Got: %s" % previous
        >>> def callback_raise(previous):
        ...     \'\'\'Fail and raise an exception.\'\'\'
        ...     raise Exception("Test")
        >>> def errback(error):
        ...     \'\'\'Recover from an exception.\'\'\'
        ...     #error.catch(Exception)
        ...     return "catched"
        >>> deferred = Deferred()
        >>> deferred.callback("start")
        >>> deferred.result
        \'start\'
        >>> deferred.add_callbacks(callback_raise, errback)
        >>> deferred.result                             #doctest: +ELLIPSIS
        <defer.DeferredException object at 0x...>
        >>> deferred.add_callbacks(callback, errback)
        >>> deferred.result
        \'catched\'
        >>> deferred.add_callbacks(callback, errback)
        >>> deferred.result
        \'Got: catched\'
        ' 
    assert ((callback is _passthrough) or isinstance (callback, collections.Callable)) 
    assert ((errback is None) or (callback_args is _passthrough) or isinstance (errback, collections.Callable)) 
    if (errback is None) : 
        errback = _passthrough...

    
    

    Fix the buggy line: assert ((errback is None) or (callback_args is _passthrough) or isinstance (errback, collections.Callable))
assistant
#Here is Python program to fix the buggy line: assert ((errback is None) or (callback_args is _passthrough) or isinstance (errback, collections.

assert ((errback is None) or (errback is _passthrough) or isinstance (errback, collections.Callable))