How protect proprietary Python code? (bytecode obfuscation?, what better?)

[Daniel Nogradi]

>  #include<python.h>
>
> char code[] = "print 'hello moshe'";
>
> void main(...)
> {
>     Py_ExecString(code);
> }

I don't get this, with python 2.4 there is no function called
Py_ExecString in any of the header files. I found something that might
do the job PyRun_SimpleString( ) in pythonrun.h, but couldn't get it
to work either. So what is really the way to execute python code in a
string from a C program?