Call python script from c++ without loading the file each time -

i have python script need call lots of times (around 160000 times) , while can in less second hard c++ code, if try load , call python script this, take hours! think if loaded script once, run loaded script on , over, faster. unfortunately, don't know how this. don't think can load file ifstream, use pyrun_simplestring on lines of string. in case isn't faster however, possible return 2d array in python, convert array std::vector?

consider following function, in file called multiply.py

#!/usr/bin/python3  def do_multiply(a, b):     c = 0     in range(0, a):         c += b     return c 

in c++ file:

// load function  pyobject *pname     = pyunicode_fromstring("multiply"); pyobject *pmodule   = pyimport_import(pname); pyobject *pfunction = pyobject_getattrstring(pmodule, "do_multiply") 

let's want call function 3 times, follows:

struct numberpair  {      int x;     int y; };  std::vector<numberpair> numberpairs { {1, 2}, {5, 6}, {10, 12} }; 

then, can call pyobject_callfunction several times, while module loaded:

for(const auto &numberpair : numberpairs) {     pyobject *product = pyobject_callfunction(pfunction, "ii", numberpair.x, numberpair.y);     if(product != null)     {         std::cout << "product " << pylong_aslong(product) << '\n';         py_decref(product);     } } 

there no need close module between calls pyobject_callfunction, shouldn't problem.