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        ...     deferred_exc = DeferredException()
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            ...
        Exception: Test

        Alternatively you can set the exception manually:

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�zDeferredException.__init__cCs&tr	|j�|j��|�|j��|j��)zRaise the stored exception.)�PY3Kr�with_tracebackrr�rrrr�raise_exceptionsz!DeferredException.raise_exceptioncGs*|D]}t|j|�r|Sq|��dS)a8Check if the stored exception is a subclass of one of the
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        <class 'Exception'>
        >>> exc.catch(OSError)   # Won't catch and raise the stored exception
        Traceback (most recent call last):
            ...
        SystemError

        This method can be used in errbacks of a Deferred:

        >>> def dummy_errback(deferred_exception):
        ...     '''Error handler for OSError'''
        ...     deferred_exception.catch(OSError)
        ...     return "catched"

        The above errback can handle an OSError:

        >>> deferred = Deferred()
        >>> deferred.add_errback(dummy_errback)
        >>> deferred.errback(OSError())
        >>> deferred.result
        'catched'

        But fails to handle a SystemError:

        >>> deferred2 = Deferred()
        >>> deferred2.add_errback(dummy_errback)
        >>> deferred2.errback(SystemError())
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    callback of the next pair.  If an exception occurs, it will be handled
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    again, the callback of the next pair will be called with the return
    value of the errback. Otherwise the exception of the errback will be
    returned to the errback of the next pair::

        CALLBACK1      ERRBACK1
         |     \       /     |
     result failure  result failure
         |       \   /       |
         |        \ /        |
         |         X         |
         |        / \        |
         |       /   \       |
         |      /     \      |
        CALLBACK2      ERRBACK2
         |     \       /     |
     result failure  result failure
         |       \   /       |
         |        \ /        |
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        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)
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        The errback method will get the most recent DeferredException and
        and any additional arguments that was specified in add_errback.

        If the errback can catch the exception it can return a value that
        will be passed to the next callback in the chain. Otherwise the
        errback chain will not be processed anymore.

        See the documentation of defer.DeferredException.catch for
        further information.

        >>> def catch_error(deferred_error, ignore=False):
        ...     if ignore:
        ...         return "ignored"
        ...     deferred_error.catch(Exception)
        ...     return "catched"
        >>> deferred = Deferred()
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�zDeferred.add_errbackcOs|j|t||d�dS)a�Add a callable (function or method) to the callback chain only.

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        and any additional arguments that was specified in add_callback.

        >>> def callback(previous, counter=False):
        ...     if counter:
        ...         return previous + 1
        ...     return previous
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�zDeferred.add_callbackcCsV|jrt��|st�}nt|t�st|t�sJ�t|j|d�}d|_||_|��dS)a�Start processing the errorback chain starting with the
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        >>> deferred = Deferred()
        >>> deferred.errback(Exception("Test Error"))
        >>> deferred.result                             #doctest: +ELLIPSIS
        <defer.DeferredException object at 0x...>
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zDeferred.errbackcCs$|jrt��d|_||_|��dS)aOStart processing the callback chain starting with the
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    <defer.Deferred object at 0x...>

    >>> deferred = defer(lambda x: x, "done")
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            thing = yield makeSomeRequestResultingInDeferred()
            print thing #the result! hoorj!
        thingummy = inline_callbacks(thingummy)

    When you call anything that results in a Deferred, you can simply yield it;
    your generator will automatically be resumed when the Deferred's result is
    available. The generator will be sent the result of the Deferred with the
    'send' method on generators, or if the result was a failure, 'throw'.

    Your inline_callbacks-enabled generator will return a Deferred object, which
    will result in the return value of the generator (or will fail with a
    failure object if your generator raises an unhandled exception). Note that
    you can't use return result to return a value; use return_value(result)
    instead. Falling off the end of the generator, or simply using return
    will cause the Deferred to have a result of None.

    The Deferred returned from your deferred generator may errback if your
    generator raised an exception::

        def thingummy():
            thing = yield makeSomeRequestResultingInDeferred()
            if thing == 'I love Twisted':
                # will become the result of the Deferred
                return_value('TWISTED IS GREAT!')
            else:
                # will trigger an errback
                raise Exception('DESTROY ALL LIFE')
        thingummy = inline_callbacks(thingummy)
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