Tengo una secuencia de comandos de Python que se conecta a Twitter Firehose y envía datos hacia abajo para su procesamiento. Antes de que funcionara bien, pero ahora estoy tratando de obtener sólo el cuerpo del texto. (No es una pregunta sobre cómo debo extraer datos de Twitter o cómo codificar / decodificar caracteres ascii). Entonces cuando lanzo mi script directamente así:

python -u fetch_script.py

Funciona bien, y puedo ver que los mensajes están llegando a la pantalla. Por ejemplo:

root@domU-xx-xx-xx-xx:/usr/local/streaming# python -u fetch_script.py 
Cuz I'm checking you out >on Facebook<
RT @SearchlightNV: #BarryLies has crapped on all honest patriotic hard-working citizens in the USA but his abuse of WWII Vets is sick #2A…
"Why do men chase after women? Because they fear death."~Moonstruck
RT @SearchlightNV: #BarryLies has crapped on all honest patriotic hard-working citizens in the USA but his abuse of WWII Vets is sick #2A…
Never let anyone tell you not to chase your dreams. My sister came home crying today, because someone told her she's not good enough.
"I can't even ask anyone out on a date because if it doesn't end up in a high speed chase, I get bored."
RT @ColIegeStudent: Double-checking the attendance policy while still in bed
Well I just handed my life savings to ya.. #trustingyou #abouttomakebankkkkk
Zillow $Z and Redfin useless to Wells Fargo Home Mortgage, $WFC, and FannieMae $FNM. Sale history LTV now 48%, $360 appraisal fee 4 no PMI.
The latest Dump and Chase Podcast http://t.co/viaRSA9W3i check it out and subscribe on iTunes, or your favorite android app #Isles

pero si trato de enviarlos al archivo de esta manera:

python -u fetch_script.py >fetch_output.txt

Me tiró de un tirón y error.

root@domU-xx-xx-xx-xx:/usr/local/streaming# python -u fetch_script.py >fetch_output.txt
ERROR:tornado.application:Uncaught exception, closing connection.
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/iostream.py", line 341, in wrapper
    callback(*args)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 331, in wrapped
    raise_exc_info(exc)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 302, in wrapped
    ret = fn(*args, **kwargs)
  File "/usr/local/streaming/twitter-stream.py", line 203, in parse_json
    self.parse_response(response)
  File "/usr/local/streaming/twitter-stream.py", line 226, in parse_response
    self._callback(response)
  File "fetch_script.py", line 57, in callback
    print msg['text']
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2026' in position 139: ordinal not in range(128)
ERROR:tornado.application:Exception in callback <functools.partial object at 0x187c2b8>
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/ioloop.py", line 458, in _run_callback
    callback()
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 331, in wrapped
    raise_exc_info(exc)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 302, in wrapped
    ret = fn(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/tornado/iostream.py", line 341, in wrapper
    callback(*args)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 331, in wrapped
    raise_exc_info(exc)
  File "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 302, in wrapped
    ret = fn(*args, **kwargs)
  File "/usr/local/streaming/twitter-stream.py", line 203, in parse_json
    self.parse_response(response)
  File "/usr/local/streaming/twitter-stream.py", line 226, in parse_response
    self._callback(response)
  File "fetch_script.py", line 57, in callback
    print msg['text']
UnicodeEncodeError: 'ascii' codec can't encode character u'\u2026' in position 139: ordinal not in range(128)

PDPoco más contexto:

Un error esta ocurriendo encallback función:

def callback(self, message):
        if message:
            msg = message
            msg_props = pika.BasicProperties()
            msg_props.content_type = 'application/text'
            msg_props.delivery_mode = 2
            #print self.count
            print msg['text']
            #self.count += 1
            ...

sin embargoSi me quito ['text'] y viviría soloprint msg Ambos casos están funcionando a la perfección.