Error when trying to call c++ function from python

Question

I am trying to write a math library in c++ for a game I made in python. I tried following the steps from answer by Florian Bosch in this question.

My operating system is windows 10. Here is the code in c++

#include <iostream>

struct Math
{

    void print()
    {
        std::cout << "hehe" << std::endl;
    }

};

extern"C"
{
    Math* newMath()
    {
        return new Math();
    }

    void math_print(Math* math)
    {
        math->print();
    }
}

Code in python

from ctypes import cdll
lib = cdll.LoadLibrary('./math.so')

class Math:
    def __init__(self):
        self.object = lib.newMath()

    def print(self):
        lib.print = (self.object)

math = Math()
math.print()

Compilation of .o and .so files

g++ -c -fPIC math.cpp -o math.o 
g++ -shared -Wl,-soname,math.so -o math.so  math.o

Error message

self._handle = _dlopen(self._name, mode)
OSError: [WinError 1114] A dynamic link library (DLL) initialization routine failed

Both my python interpreter and g++ compiler are 64 bits.

After n.'pronouns'm's comment about linkers, I decided to remove the #include<iostream> from c++ file to see what happens, and it sort of worked. I changed the c++ code to

//#include <iostream>

struct Math
{

    int print()
    {
        return 5;
    }

};

extern"C"
{
    Math* newMath()
    {
        return new Math();
    }

    void math_print(Math* math)
    {
        math->print();
    } 

and python code to

from ctypes import cdll
lib = cdll.LoadLibrary('./math.so')

class Math:
    def __init__(self):
        self.object = lib.newMath()

    def print(self):
        lib.math_print = (self.object)

math = Math()
print(math.print())

I would expect it to print 5, but it prints none and no error this time. I will also definitely need libraries in the future to access the math functions.