使用Boost Python的Python模块是空的?

我正在尝试学习提升python API来创建我自己的python(3.6(模块。 我能够成功编译以下 c++ 代码并获得生成的 pythonTest.dll 我正在生成。

#define BOOST_ALL_DYN_LINK
#include <boost/python.hpp>
#include <string>
const std::string hello_world(void)
{
return std::string("hello world!n");
}
BOOST_PYTHON_MODULE(pythonTest)
{
namespace python = boost::python;
python::def("hello_world", hello_world);
}

然后，我将 pythonTest.dll 复制到我的模块文件夹中，如下所示。 (我将pythonTest.dll重命名为pythonTest.pyd(

pythonTest
__init__.py
pythonTest.pyd

当我执行python时，它将导入模块，但它找不到我的hello_world函数：

Python 3.6.1 (v3.6.1:69c0db5, Mar 21 2017, 18:41:36) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import pythonTest
>>> pythonTest.hello_world()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
**AttributeError: module 'pythonTest' has no attribute 'hello_world'**
>>> help(pythonTest)
Help on package pythonTest:
NAME
pythonTest
PACKAGE CONTENTS
pythonTest
FILE
<...>pythontest__init__.py
>>> dir(pythonTest)
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__','__name__', '__package__', '__path__', '__spec__']
>>>

我错过了什么？ 谢谢。

编辑： 这是可视化工作室构建的输出：

1>------ Rebuild All started: Project: pythonTest, Configuration: Release x64 ------
1>Build started 7/10/2017 2:49:53 PM.
1>InitializeBuildStatus:
1>  Creating "x64ReleasepythonTest.tlogunsuccessfulbuild" because "AlwaysCreate" was specified.
1>ClCompile:
1>  pythonTest.cpp
1>G:DataBackupdev-vc133rdPartyboost_1_64_0boost/python/detail/caller.hpp(55): warning C4244: 'return' : conversion from 'Py_ssize_t' to 'unsigned int', possible loss of data
1>Link:
1>     Creating library G:DataBackupdev-vc13temppythonTestx64ReleasepythonTest.lib and object G:DataBackupdev-vc13temppythonTestx64ReleasepythonTest.exp
1>  Generating code
1>  Finished generating code
1>  pythonTest.vcxproj -> G:DataBackupdev-vc13temppythonTestx64ReleasepythonTest.dll
1>PostBuildEvent:
1>          1 file(s) copied.
1>FinalizeBuildStatus:
1>  Deleting file "x64ReleasepythonTest.tlogunsuccessfulbuild".
1>  Touching "x64ReleasepythonTest.tlogpythonTest.lastbuildstate".
1>
1>Build succeeded.
1>
1>Time Elapsed 00:00:04.21
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========