pocketpy: python interpreter in 1 file

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pkpy is a lightweight(~10000 LOC) Python interpreter for game scripting, built on C++17 with STL.

It aims to be an alternative to lua for game scripting, with elegant syntax, powerful features and competitive performance. pkpy is extremely easy to embed via a single header file pocketpy.h, without external dependencies.

Please see https://pocketpy.dev for details or try Live Demo.

Quick start

Download the pocketpy.h on our GitHub Release page. And #include it in your project.

Compile flags

To compile it with your project, these flags must be set:

--std=c++17 flag must be set
Exception must be enabled
RTTI is not required

!!! For maximum performance, we recommend to use clang++ with -O2 flag. !!!

Example

#include "pocketpy.h"

using namespace pkpy;

int main(){
    // Create a virtual machine
    VM* vm = new VM();
    
    // Hello world!
    vm->exec("print('Hello world!')", "main.py", EXEC_MODE);

    // Create a list
    vm->exec("a = [1, 2, 3]", "main.py", EXEC_MODE);

    // Eval the sum of the list
    PyObject* result = vm->exec("sum(a)", "<eval>", EVAL_MODE);
    std::cout << CAST(int, result);   // 6
    return 0;
}

Features

Name	Example	Supported
If Else	`if..else..elif`	YES
Loop	`for/while/break/continue`	YES
Function	`def f(x,*args,y=1):`	YES
Subclass	`class A(B):`	YES
List	`[1, 2, 'a']`	YES
ListComp	`[i for i in range(5)]`	YES
Slice	`a[1:2], a[:2], a[1:]`	YES
Tuple	`(1, 2, 'a')`	YES
Dict	`{'a': 1, 'b': 2}`	YES
F-String	`f'value is {x}'`	YES
Unpacking	`a, b = 1, 2`	YES
Star Unpacking	`a, *b = [1, 2, 3]`	YES
Exception	`raise/try..catch`	YES
Dynamic Code	`eval()/exec()`	YES
Reflection	`hasattr()/getattr()/setattr()`	YES
Import	`import/from..import`	YES
Context Block	`with <expr> as <id>:`	YES
Type Annotation	`def f(a:int, b:float=1)`	YES
Generator	`yield i`	YES
Decorator	`@cache`	YES

Contribution

All kinds of contributions are welcome.

Submit a Pull Request
- fix a bug
- add a new feature
Open an Issue
- any suggestions
- any questions

Check our Coding Style Guide if you want to contribute C++ code.

Reference

cpython

The official implementation of Python programming language.
byterun

An excellent learning material. It illustrates how Python's virtual machine works.

License

pkpy is licensed under the MIT License.

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