Trying to use C++ implementation of python but api_implementation.Type() still returns 'python' instead of 'cpp'

[Oi Lee]

I initially used a pure python implementation of protocol buffers, but I changed it later to use the c++ library implementation. So I installed protobuf using these github instructions and then I followed these instructions to use the C++ implementation. But when I use  api_implementation.Type(), it still returns 'python'.  Why is it still using the python implementation?  If this function should not be used, then what should I use to check implementation? 

I'm using protocol buffers 2.6.1 on CentOS. 

[Feng Xiao]

+Jie

On Fri, Jul 29, 2016 at 10:10 AM, Oi Lee <lee...@gmail.com> wrote:

I initially used a pure python implementation of protocol buffers, but I changed it later to use the c++ library implementation. So I installed protobuf using these github instructions and then I followed these instructions to use the C++ implementation. But when I use  api_implementation.Type(), it still returns 'python'.  Why is it still using the python implementation?  If this function should not be used, then what should I use to check implementation? 

I'm using protocol buffers 2.6.1 on CentOS. 

--
You received this message because you are subscribed to the Google Groups "Protocol Buffers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+u...@googlegroups.com.
To post to this group, send email to prot...@googlegroups.com.
Visit this group at https://groups.google.com/group/protobuf.
For more options, visit https://groups.google.com/d/optout.

[Jie Luo]

 I tried and it returns 'cpp' as expected.

First, make sure you use the correct commands:

python setup.py build --cpp_implementaion

python setup.py install --cpp_implementaion

Second, Where do you put your .py file to check api_implementation.Type()? Make sure your file does not under protobuf/python (DO NOT in the same directory as setup.py)

[Oi Lee]

My .py file that checks for implementation is in a completely different folder. I'll try re-installing again.

[Oi Lee]

When I do 

[localhost python]$ sudo python setup.py build --cpp_implementaion

Installed [...]/protobuf-2.6.1/python/.eggs/google_apputils-0.4.2-py2.7.egg

Searching for python-gflags>=1.4

Reading https://pypi.python.org/simple/python-gflags/

Best match: python-gflags 3.0.5

Downloading https://pypi.python.org/packages/1f/01/3ca6527f51b7ff26abb635d4e7e2fa8413c7cf191564cc2c1e535f50dec7/python-gflags-3.0.5.tar.gz#md5=0e3a06cb99b9883bf6abacc489f31297

Processing python-gflags-3.0.5.tar.gz

Writing /tmp/easy_install-c_jdOd/python-gflags-3.0.5/setup.cfg

Running python-gflags-3.0.5/setup.py -q bdist_egg --dist-dir /tmp/easy_install-c_jdOd/python-gflags-3.0.5/egg-dist-tmp-M2uDeX

zip_safe flag not set; analyzing archive contents...

Moving python_gflags-3.0.5-py2.7.egg to /home/oi.lee/Downloads/protobuf-2.6.1/python/.eggs

Installed [...]/protobuf-2.6.1/python/.eggs/python_gflags-3.0.5-py2.7.egg

Searching for python-dateutil>=1.4

Reading https://pypi.python.org/simple/python-dateutil/

Best match: python-dateutil 2.5.3

Downloading https://pypi.python.org/packages/b7/9f/ba2b6aaf27e74df59f31b77d1927d5b037cc79a89cda604071f93d289eaf/python-dateutil-2.5.3.zip#md5=52b3f339f41986c25c3a2247e722db17

Processing python-dateutil-2.5.3.zip

Writing /tmp/easy_install-F99Iys/python-dateutil-2.5.3/setup.cfg

Running python-dateutil-2.5.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-F99Iys/python-dateutil-2.5.3/egg-dist-tmp-YXfHJw

warning: no previously-included files matching '__pycache__' found anywhere in distribution

warning: no previously-included files matching '*.py[co]' found anywhere in distribution

Moving python_dateutil-2.5.3-py2.7.egg to /home/oi.lee/Downloads/protobuf-2.6.1/python/.eggs

Installed [...]/protobuf-2.6.1/python/.eggs/python_dateutil-2.5.3-py2.7.egg

usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]

   or: setup.py --help [cmd1 cmd2 ...]

   or: setup.py --help-commands

   or: setup.py cmd --help

error: option --cpp_implementaion not recognized

On Friday, July 29, 2016 at 3:25:10 PM UTC-6, Jie Luo wrote:

[Paul Johnston]

"--cpp_implementaion" misspelled, should be "--cpp_implementation"

[Oi Lee]

Thanks. That worked. However, when I run my testfile.py I get the following error:

[localhost git]$ python testfile.py 

Traceback (most recent call last):

  File "testfile.py", line 4, in <module>

    import test

  File "[...]/Documents/git/test.py", line 4, in <module>

    import proto.DSMessagesv3_pb2 as msg

  File "[...]/Documents/git/proto/DSMessagesv3_pb2.py", line 6, in <module>

    from google.protobuf import descriptor as _descriptor

  File "/usr/lib/python2.7/site-packages/google/protobuf/descriptor.py", line 50, in <module>

    from google.protobuf.pyext import _message

ImportError: cannot import name _message

From the descriptor.py file here is where it fails:

  if api_implementation.Version() == 2:

    from google.protobuf.pyext import _message

  else:

    from google.protobuf.internal import cpp_message

Also, before I ran my file I export the following environment variables per README file in the python folder.

$ export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp
$ export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION_VERSION=2