Get a return value from C++ program to a Python script using subprocess

Question

I am using subprocess.Popen() in a Python script to run an executable of C++ program. I need to return a value from the C++ program which can be used in the Python script.

I have lots of printf statements in the C++ program, so I can't use PIPE and get the output.

Can I return a single value which is received by the script?

Answer 1

Check the returncode attribute of the object returned by Popen .

Note that it is only filled if you have called poll() or wait() first on the Popen object.

Answer 2

This issue is solved. Basically python script subprocess can recieve exit code. cpp file can return that code from int main() which can be used as exit code of the prog in python script.