How to set the environment in which python snippet can run in c++ program?

Question

I have created two files embed.py useEmbed.cppin my home directory.

embed.py

import os

print os.getcwd()

useEmbed.cpp

  #include <iostream>
  #include "Python.h"
  using namespace std;

  int main()
  {
       Py_Initialize();
       PyRun_SimpleFile("embed.py");
       Py_Finalize();

      return 0;
  }

Command g++ useEmbed.cpp -o useEmbed returns Python.h not found, What should i do next step to make .cpp file compiled successfully and return the right answer? Thank for tips about how to set environment to make this test OK.

Thank you!

UPDATE: Thanks for tips from David and Alexander. Problem has been solved after install package python-devel in my Fedora Linux.

David L. · Accepted Answer · 2011-03-27 19:59:57Z

On linux, you can use python-config to get the compiler flags (python-config --cflags) and linker flags (python-config --ldflags).

For example:

#> python-config --cflags -I/usr/include/python2.5 -I/usr/include/python2.5 -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes

#> python-config --ldflags -L/usr/lib/python2.5/config -lpthread -ldl -lutil -lm -lpython2.5

To compile your program you can run g++ useEmbed.cpp -o embed "cflags" "ldflags" :

#> g++ useEmbed.cpp -o embed -I/usr/include/python2.5 -I/usr/include/python2.5 -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -L/usr/lib/python2.5/config -lpthread -ldl -lutil -lm -lpython2.5

I had to change useEmbed.cpp a little bit:


    #include "Python.h"
    #include <iostream>

    using namespace std;

    int main()
    {
      Py_Initialize();
      FILE *file = fopen("embed.py","r+");
      PyRun_SimpleFile(file,"embed.py");
      Py_Finalize();
      fclose(file);

      return 0;
    }

Alexander Gessler · Accepted Answer · 2011-03-27 17:30:31Z

3

Make sure you point the compiler to the directory where Python.h is located, i.e. use the -I<path> switch with gcc. Of course you need to have the Python development files installed.

answered Mar 27, 2011 at 17:30

Alexander Gessler

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1 Comment

Jason Over a year ago

With python source code directory, use gcc -I <path to Include/> useEmbed.cpp -o embed, returns pyconfig.h not found. How to do with python source file directoty?

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