Question

当我在Boost.Python中使用类时，我收到错误TypeError: __init__() should return None, not 'NoneType'（我可以运行简单的“Hello，world”）。

环境

macOS Sierra
我使用pyenv-virtualenv
- Python 3.6.0
- $ source activate py36
我通过自制软件安装了boost-python
1. $pyenv global py36
2. $brew install boost
3. $brew install boost-python --with-python3

代码

这是我尝试过的简单代码（test.cpp）。

#include <boost/python.hpp>
using namespace boost::python;

int main(){

}

class accumulator {
public:
    int operator()(int v) {
        v_ += v;
        return v_;
    }

    int value() const {
        return v_;
    }

private:
    int v_;
};

BOOST_PYTHON_MODULE(test)
{

    class_<accumulator>("accumulator")
        .def("__call__",
             &accumulator::operator())
        .add_property("value", &accumulator::value)
        ;
}

生成文件

CC = clang++ -std=c++11 -stdlib=libc++
PYTHON_ROOT = /usr/local/var/pyenv/versions/3.6.0
PYTHON = -lpython3.6m -lboost_python3

# location of the Boost Python include files and library

BOOST_INC = /usr/local/Cellar/boost-python/1.64.0/include
BOOST_LIB = /usr/local/Cellar/boost-python/1.64.0/lib

# compile mesh classes
TARGET = test

$(TARGET).so: $(TARGET).o
    $(CC) $(TARGET).o $(PYTHON) -I$(PYTHON_ROOT)/include/python3.6m  -L$(BOOST_LIB) -L$(PYTHON_ROOT)/lib  -o $(TARGET).so

$(TARGET).o: $(TARGET).cpp
    $(CC)  -I$(PYTHON_ROOT)/include/python3.6m -I$(BOOST_INC) -c $(TARGET).cpp

编译

$ make
clang++ -std=c++11 -stdlib=libc++  -I/usr/local/var/pyenv/versions/3.6.0/include/python3.6m -I/usr/local/Cellar/boost-python/1.64.0/include -c test.cpp
clang++ -std=c++11 -stdlib=libc++ test.o -lpython3.6m -lboost_python3 -I/usr/local/var/pyenv/versions/3.6.0/include/python3.6m  -L/usr/local/Cellar/boost-python/1.64.0/lib -L/usr/local/var/pyenv/versions/3.6.0/lib  -o test.so

$ python
Python 3.6.0 (default, Dec 28 2016, 23:31:45)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import test
>>> a = test.accumulator()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() should return None, not 'NoneType'

我在Japanese中做了同样的问题。如果我在其中任何一个中得到它，我会翻译解决方案。

使用类时Boost.Python错误

0 个答案: