# pocketpy: python interpreter in 1 file
**English |** [**简体中文**](README_zh.md)
pkpy is a lightweight(~14K 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](https://pocketpy.dev/static/web/).
## Supported Platforms
pkpy should work on any platform with a C++17 compiler.
These platforms are officially tested.
+ Windows 64-bit
+ Linux 64-bit / 32-bit
+ macOS 64-bit
+ Android 64-bit / 32-bit
+ iOS 64-bit
+ Emscripten 32-bit
+ Raspberry Pi 64-bit
## Quick Start
Download the `pocketpy.h` on our [GitHub Release](https://github.com/blueloveTH/pocketpy/releases) page.
And `#include` it in your project.
You can also use cmake to build it from source. See CMakeLists.txt for details.
These variables can be set to control the build process:
+ `PK_BUILD_STATIC_LIB` - Build the static library
+ `PK_BUILD_SHARED_LIB` - Build the shared library
### Compile Flags
To compile it with your project, these flags must be set:
+ `--std=c++17` flag must be set
+ Exception must be enabled
### Example
```cpp
#include "pocketpy.h"
using namespace pkpy;
int main(){
// Create a virtual machine
VM* vm = new VM();
// Hello world!
vm->exec("print('Hello world!')");
// Create a list
vm->exec("a = [1, 2, 3]");
// Eval the sum of the list
PyObject* result = vm->eval("sum(a)");
std::cout << CAST(int, result); // 6
// Bindings
vm->bind(vm->_main, "add(a: int, b: int)",
[](VM* vm, ArgsView args){
int a = CAST(int, args[0]);
int b = CAST(int, args[1]);
return VAR(a + b);
});
// Call the function
PyObject* f_add = vm->_main->attr("add");
result = vm->call(f_add, VAR(3), VAR(7));
std::cout << CAST(int, result); // 10
// Dispose the virtual machine
delete vm;
return 0;
}
```
## Features
Check this [Cheatsheet](https://reference.pocketpy.dev/python.html)
for a quick overview of the supported 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 as :` | 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](https://pocketpy.dev/coding_style_guide/) if you want to contribute C++ code.
## Reference
+ [cpython](https://github.com/python/cpython)
The official implementation of Python programming language.
+ [byterun](https://www.aosabook.org/en/500L/a-python-interpreter-written-in-python.html)
An excellent learning material. It illustrates how Python's virtual machine works.
+ [box2d](https://box2d.org/)
The world's best 2D physics engine, written by Erin Catto. `box2d` now becomes a built-in module in pkpy `v1.1.3` and later.
## Star History
[](https://star-history.com/#blueloveth/pocketpy&Date)
## License
[MIT License](http://opensource.org/licenses/MIT)