In [3]:
from google.transit import gtfs_realtime_pb2
import urllib2


---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-3-516e0452a539> in <module>()
----> 1 from google.transit import gtfs_realtime_pb2
      2 import urllib2

/Users/datascientist/anaconda/lib/python2.7/site-packages/google/transit/gtfs_realtime_pb2.py in <module>()
     18 # source: gtfs-realtime.proto
     19 
---> 20 from google.protobuf import descriptor as _descriptor
     21 from google.protobuf import message as _message
     22 from google.protobuf import reflection as _reflection

ImportError: No module named protobuf

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