Python packages path issues

Question

Using Python 2.7, OS: Ubuntu 16.04 64 bit.

I am writing one sample application using Python C API. I have created one virtual environment and installed dependent package in virtualenv to run this application. Below is my code.

#include <iostream>
#include <Python.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char* argv[]){    
  Py_OptimizeFlag=1;
  //Py_SetPythonHome((char *)"/home/user/workspace/venv_2_7/bin/python");
  Py_SetProgramName((char *)"python_test");
  Py_Initialize();

  PySys_SetPath((char *)"/home/user/workspace/venv_2_7/lib;/home/user/workspace/venv_2_7/lib/python2.7/site-packages;");

  PySys_SetArgv(argc, argv);

  PyObject* PyFileObject = PyFile_FromString((char *)"/home/user/Projects/python_test/test.py", (char *)"r");
  int ret = PyRun_SimpleFileEx(PyFile_AsFile(PyFileObject), (char *)"/home/user/Projects/python_test/test.py", 1);

  if (ret != 0) {
    printf ("Failed to launch the application.\n");
    return 0;
  }

  Py_Finalize();
  return 0;
}

As I run this file, I am getting this error:

Traceback (most recent call last):
  File "/home/user/Projects/python_test/test.py", line 23, in <module>
    ....
  File "/home/user/Projects/python_test/sample/__init__.py", line 12,     in <module>
    import logging
ImportError: No module named logging

The message clearly says that system and other packages required for application are not found when we run the application. Even though I set the path, it is not found.

How to tell application where to find the all the required system and other packages?
How to set through API so that we did not get error?

score 0 · Answer 1 · answered Apr 11 '17 at 19:00

I think that the first item in your path should include the python2.7 folder, as that will be where the standard library files should be, not in lib.

/home/user/workspace/venv_2_7/lib/python2.7

But you should double check that they are there. If your virtualenv tool is older then it may have a different default behavior in this area.

Python packages path issues

1 Answers1