Calling instances with arguments

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C++

Python

I am calling a class from Python in C++. While creating instance of a class such that pInstance = Py_CallObject(pClass, NULL), How to pass arguments to instances using PyObject?
I have a constructor in python such that I have to pass arguments when instance is created. This is my constructor in Python program

class Model:
	      def Model(self, str1, str2):

What I have tried:

I have created the instance using

pInstance = Py_CallObject(pClass, NULL)

but how to pass arguments to instance