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)

On Fri, Jul 29, 2016 at 12:30 PM, Feng Xiao <xiaof...@google.com> wrote:

> +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
>> <https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Fgoogle%2Fprotobuf%2Fblob%2Fmaster%2Fsrc%2FREADME.md&sa=D&sntz=1&usg=AFQjCNG2r1BsKNbsZQp7Tx0dL3_pTM1fNg>
>>  and
>> then I followed these instructions
>> <https://github.com/google/protobuf/blob/master/python/README.md> to use
>> the C++ implementation. But when I use  api_implementation.Type()
>> <https://cs.corp.google.com/piper///depot/google3/net/proto2/python/internal/api_implementation.py?is_navigation=1&q=package:%5E(piper)$+file:(%5E)//depot/google3/net/proto2/python/internal/api_implementation(%5C.(swig%7Cpy%7Cspt)$%7C/(__init__%5C.(swig%7Cpy%7Cspt))?$)&l=79>,
>>  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.
>>
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>

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