title: Google Assistant fails on RPi2 with print error
body: <p>Managed to get through most of the install until the end when attempting to run the sample. </p>
  
  <pre><code>python -m googlesamples.assistant.auth_helpers --client-secrets /home/pi/client_secret.json
  
  Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 151, in _run_module_as_main
  mod_name, mod_spec, code = _get_module_details(mod_name)
  File "/usr/lib/python3.4/runpy.py", line 118, in _get_module_details
  return _get_module_details(pkg_main_name)
  File "/usr/lib/python3.4/runpy.py", line 104, in _get_module_details
  spec = importlib.util.find_spec(mod_name)
  File "/usr/lib/python3.4/importlib/util.py", line 86, in find_spec
  parent = __import__(parent_name, fromlist=['__path__'])
  File "/home/pi/google/lib/python3.4/site-packages/googlesamples/assistant/auth_helpers/__init__.py", line 21, in &lt;module&gt;
  import google.auth.transport.grpc
  File "/home/pi/google/lib/python3.4/site-packages/google/auth/transport/grpc.py", line 20, in &lt;module&gt;
  import grpc
  File "/home/pi/google/lib/python3.4/site-packages/grpc/__init__.py", line 37, in &lt;module&gt;
  from grpc._cython import cygrpc as _cygrpc
  File "src/python/grpcio/grpc/_cython/cygrpc.pyx", line 32, in init grpc._cython.cygrpc (src/python/grpcio/grpc/_cython/cygrpc.c:28305)
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 3036, in &lt;module&gt;
  @_call_aside
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 3020, in _call_aside
  f(*args, **kwargs)
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 3064, in _initialize_master_working_set
  for dist in working_set
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 3064, in &lt;genexpr&gt;
  for dist in working_set
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2594, in activate
  declare_namespace(pkg)
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2162, in declare_namespace
  _handle_ns(packageName, path_item)
  File "/home/pi/google/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2097, in _handle_ns
  loader.load_module(packageName)
  File "./google.py", line 42
  print head,body,tail
  
  SyntaxError: Missing parentheses in call to 'print'
  </code></pre>
  
  <p>Saw one <a href="https://stackoverflow.com/questions/43682056/google-assistant-sdk-on-raspberry-pi-2/43812210">example</a> where a few have got it work but it's not clear to me if they're using a python2 or 3 venv? Can anyone assist?</p>