andy80@noteboontu:~/documenti/sviluppo/python/twisted_test$ python tw_test1.py Ricevuto 45Ricevuto 46Unhandled error in Deferred:Traceback (most recent call last): File "tw_test1.py", line 14, in <module> d.callback(45) File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 239, in callback self._startRunCallbacks(result) File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 304, in _startRunCallbacks self._runCallbacks()--- <exception caught here> --- File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 317, in _runCallbacks self.result = callback(self.result, *args, **kw) File "tw_test1.py", line 10, in callback_2 return arg + "ciao"exceptions.TypeError: unsupported operand type(s) for +: 'int' and 'str'