To create Python bindings for Rust functions, you can use the `rust-cpython` library. Here is a step-by-step guide for beginners:

Install Rust and Python on your system if you haven't already.

Create a new Rust library project with `cargo new my_project_name --lib`.

Add `rust-cpython` as a dependency in your Cargo.toml file:

```makefile
[dependencies]
cpython = "0.5.1"
```
Write your Rust code that you want to expose to Python.

Create a new Rust file called lib.rs in the src directory and add the following:
```rust
extern crate cpython;

use cpython::{Python, py_module_initializer, py_fn};

// Define the Rust function you want to expose to Python
#[py_fn(m, "hello_world")]
fn hello_world_py(_py: Python, arg: i32) -> i32 {
    // Call your Rust function here and return the result
    println!("Hello, world! You passed in {}", arg);
    return arg;
}

// Define the module initializer function
py_module_initializer!(my_project_name, |py, m| {
    m.add(py, "hello_world", py_fn!(hello_world_py))?;
    Ok(())
});
```
Build your Rust project with cargo build. This will create a dynamic library file in the target/debug directory.

Create a new Python file and import your Rust library:

```python
import cpython
my_project_name = cpython.lib.load_module('my_project_name', 'target/debug')
```
Call your Rust function from Python:

```python
result = my_project_name.hello_world(42)
print(result)  # Should print "42"
```

That's everything you need.
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