c++ - Syntax Error in Cython Example -

i trying build cython example @ this page.

i know post similar 1 other question. however, generated totally different error messages.

here code:

rectangle.cpp

#include "rectangle.h"  using namespace shapes;  rectangle::rectangle(int x0, int y0, int x1, int y1){     x0 = x0;     y0 = y0;     x1 = x1;     y1 = y1; }  rectangle::~rectangle() {}  int rectangle::getlength() {     return (x1 - x0); }  int rectangle::getheight() {     return (y1 - y0); }   int rectangle::getarea() {     return (x1 - x0) * (y1 - y0); }  void rectangle::move(int dx, int dy) {     x0 += dx;     y0 += dy;     x1 += dx;     y1 += dy; } 

rectangle.h

namespace shapes {     class rectangle {     public:     int x0, y0, x1, y1;     rectangle(int x0, int y0, int x1, int y1);     ~rectangle();     int getlength();     int getheight();     int getarea();     void move(int dx, int dy);     };  } 

rectangle.pyx

# distutils: language = c++ # distutils: sources = rectangle.cpp  cdef extern "rectangle.h" namespace "shapes":     cdef cppclass rectangle:         rectangle(int, int, int, int)         int x0, y0, x1, y1         int getlength()         int getheight()         int getarea()         void move(int, int)  cdef class pyrectangle:     cdef rectangle *thisptr     def __cinit__(self, int x0, int y0, int x1, int y1):         self.thisptr = new rectangle(x0, y0, x1, y1)     def __dealloc__(self):         del self.thisptr     def getlength(self):         return self.thisptr.getlength()     def getheight(self):         return self.thisptr.getheight()     def getarea(self):         return self.thisptr.getarea()     def move(self, dx, dy):         self.thisptr.move(dx, dy) 

setup.py

from distutils.core import setup cython.build import cythonize  setup(ext_modules = cythonize(        "rectangle.pyx",            # our cython source        sources=["rectangle.cpp"],  # additional source file(s)        language="c++",             # generate c++ code       )) 

i have admit had same mistake missing following lines in rectangle.pyx @ first place.

# distutils: language = c++ # distutils: sources = rectangle.cpp 

after read through post @ here, realized , fixed it.

however, when use following statement compile c++ class,

python rectangle.pyx 

i had following error message:

file "rectangle.pyx", line 4     cdef extern "rectangle.h" namespace "shapes":               ^ syntaxerror: invalid syntax 

why error pops up? may know how fix it?

many thanks. :)

===================================================

ps: when try run setup.py, had g++ error:

i ran:

python setup.py build_ext 

and g++ error

error: command 'g++' failed exit status 1 

according @bakuriu 's advice, found following procedure works:

suppose using command prompt

1. cd directory contains .pyx , setup files.

2. using cython build extension, such

   cython -a rect.pyx --cplus

3. using python setup extension, such as

   python setup.py build_ext --inplace

when using extension, can:

1. append directory of .pyd file system path

   import sys

   sys.path.append("c:\\yourdirectory")

2. using extension :)

   import rectangle

   r = rectangle.pyrectangle(1,2,3,4)