Reading files using some Pyhton or any script and converting data into C++ key=>value pair (STL maps)

It is not quite clear what you are actually trying to do. However, if you merely want to read the contents of the file into a std::map at runtime, then you just have to parse the lines of the file:

#include <iostream>
#include <string>
#include <sstream>
#include <map>

int main() {
    //
    std::stringstream ss{R"(#define David     data(12345)
#define Mark      data(13441)
#define Sarah     data(98383)
#define Coner     data(73834))"};

    std::map<std::string, std::string> m;
    std::string line;
    while (std::getline(ss,line)){
        std::string dummy;
        std::string name;
        std::string data;
        std::stringstream linestream{line};
        linestream >> dummy >> name >> data;
        auto start = data.find('(');
        auto stop = data.find(')');
        m[data.substr(start+1,stop-start-1)] = name;
    }
    for (const auto& e : m) {
        std::cout << e.first << " " << e.second << "\n";
    }
    return 0;
}

You merely have to replace the stringstream with an ifstream.