The `addCallbacks` method in `twisted.internet.defer.DeferredList` class is used to add callback functions to the deferred list object. It takes two arguments: `callback` and `errback`. The `callback` argument is a callable function or method that will be executed when all the deferreds in the list have been called successfully. The result of each deferred will be passed as arguments to this function. The `errback` argument is a callable function or method that will be executed if any of the deferreds in the list fail. The failure reason of each deferred will be passed as arguments to this function. When either `callback` or `errback` is called, the `result` attribute of the `DeferredList` object will be updated accordingly.
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