How to add a variable value inside a text variable in C++

In my C++ code, I am executing some commands using python as follows:

std::string word = "Something";
std::cout << word;                         //will execute using C++
PyRun_SimpleString("import sys");          // will execute using Python

The problem is how to pass word to Python ?

I want something like this: PyRun_SimpleString("Hello %" %word);

In Python you can do: "Hello {}".format(word) and the result "Hello Something"

I found something like this: sprintf(str, "hello %s", word); But the problem is printf or sprintf will send it to console and will not return the value of word.