embedding, PyString_FromString

[Martin v. Löwis]

> int main(int argc, char* argv[])
>  {
>   Py_Initialize();
>   PyObject *pstr1;
>   char pstr[20];
>   strcpy(pstr,"recode");
>   pstr1 = PyString_FromString(pstr);
>   PyRun_SimpleString("print 'hello '+pstr1");
>   return 0;
>  }

Declaring a Variable in C with the C identifier pstr1 doesn't
magically make such a variable appear in Python. You need to
pick some namespace to evaluate this statement in, and then you
need to bind the variable in that namespace.

Since the variable pstr1 is undefined in Python, you get the 
NameError.

Regards,
Martin