Adding Python to C++: not finding Python.h

Question

I want to add some functions written in Python to my C++ program:

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

using namespace std;

int main(){
    int a = 0;
    cout << a;
    return 0;
}

But when I compile this program using commend g++ main.cpp -Wall -o main I have an error: fatal error: Python.h: No such file or directory

I was trying to solve the problem by installing python2.7 -dev by sudo apt-get install python2.7-dev, but it didn't help. Can someone suggest what more I can do to fix this problem?

Josh · Accepted Answer · 2014-05-18 07:35:38Z

2

Additional note:

Since Python may define some pre-processor definitions which affect the standard headers on some systems, you must include Python.h before any standard headers are included.

answered May 18, 2014 at 7:35

Josh

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1 Comment

John Zwinck Over a year ago

This should be a comment rather than an answer, as it does not solve the problem, but rather attempts to head off an upcoming additional problem after the main one is fixed.

John Zwinck · Accepted Answer · 2014-05-18 07:28:14Z

1

You need to tell the compiler where to find the Python headers. For example, on some systems you'd do this:

g++ -I /usr/include/python2.7 ...

answered May 18, 2014 at 7:28

John Zwinck

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4 Comments

Rop Over a year ago

I made g++ -I usr/include/python2.7/Python.h main.cpp -Wall -o main but I still have the same error. Am I doing something wrong?

John Zwinck Over a year ago

You added Python.h to the command line. Don't do that, do what I wrote (the ... is meant to be your main.cpp and the rest). Read the manual regarding the -I option.

Josh Over a year ago

@Rop you're also missing a leading / on that path

Rop Over a year ago

@JohnZwinck For my the commend: g++ -I/usr/include/python2.7 -lpython2.7 main.cpp -Wall -o main works good now.

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