embedding python module error

Question

So i have a c to python wrapper that takes input strings and pass them to a python function. the error im getting is that the python API is not recognizing my python file...

PyObject *pName, *pModule, *pFunc;
QString pyFile="Test.py";
Py_Initialize();
pName = PyUnicode_FromString(pyFile.toAscii().data());
pModule = PyImport_Import(pName);

error is "ImportError: No module named Test.py" This is when i have my Test.py in the same directory as my project

when i placed my Test.py up one level in my directory tree, another error came up error is "Import by filename is not supported"

so i guess absolute paths dont work? but in the first case in my example, i clearly placed my Test.py in the same directory as my project, why am i getting the error? python code is:

import sys
import os
def printFileClass(fileName, className):
 print ("The OMC CORBA File name is ", fileName,"\n")
 print ("The selected Modelica Class is ", className)
 return ("Done operations")
def main():
 print ("Hello! Here is testing script's main \n")
if __name__=='__main__':
main()

• Nathan Ernst: I would seriously suggest not using the name "test" for any python module or script. There's a built-in module with that name and creating your own always causes problems. Try dropping the ".py" from your module name on the import.
• PeterG: so i tried with just Test, but it gave me the same error... =(

Answer 1

The PYTHONPATH environment variable can be used to fix your problem.

In your code, you can do this somewhere before Py_Initialize():

setenv("PYTHONPATH", ".", 0); // #include <stdlib.h> to get the prototype

The third parameter, 0, means overwrite - it's zero so you can also pass PYTHONPATH from the shell. If you want to always use a path that you coded, you can set that to 1.

I'm not sure this doesn't expose you to other problems, but for a simple test it works.

Also, don't include the .py extension in the module name you pass to PyImport_Import.

I tested this on a Linux system.

• Radu C: Just going through the docs, Python.h already included stdlib.h for you.

Answer 2

It's true in the first case there is no module named "Test.py". Your module, in the file "Test.py", is named "Test". Try importing that. "Test.py" would be the "py" submodule in a package named "Test."