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Editorial Team
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Asked: 2026-06-14T22:19:34+00:00

I have a scenario where I have some functions in C++ classes and I

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I have a scenario where I have some functions in C++ classes and I want to be able to call them using a python script. Let’s say I have a function

void greet(_msg);
    std::cout >> _msg >> std::endl;

I want to be able to call it trough a custom Python call and pass arguments to it, for example using

saySomething("Hello")

As a .py file I want it to call the greet function and pass “Hello” as an argument.

I know it’s a subject that has been throughly discussed, and I’ve done a share of research on embedding python in C++, I’ve managed to read values from a python script using the standard Python/C API and run a function in Python from C++ and pass argument to it, but I can’t seem to get my head around how to achieve this specific outcome.

I’ve had a look at ctypes and various wrappin libraries such as boost:python or swig, but I can’t seem to understand to which degree they could help me achieve want I want.

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1 Answer

  1. Editorial Team

    Depending on which version of Python you are interested in, 2.x or 3.x,
    read through the Extending and Embedding the Python Interpreter chapter for 2.x or 3.x. You are interested only in extending Python, so section the 1. Extending Python with C or C++ will provide you with complete explanation how to implement what you need in order to be able to call your functions implemented in C++ from Python script.

    Certainly, there are numerous libraries and generators which allow you to wrap C/C++ APIs for Python (e.g. Boost.Python or SWIG), but your case sounds simple enough, that for the purpose of learning it is IMO better to get familiar with Python C API. Even if you use these tools, you will frequently have to get down to Python C API anyway or at least understand it.

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