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+---
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+icon: dot
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+title: Comparison with CPython
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+order: 99
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+---
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+
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+[cpython](https://github.com/python/cpython) is the reference implementation of the Python programming language. It is written in C and is the most widely used implementation of Python.
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+
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+## The design goal
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+
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+**pkpy aims to be an alternative to lua for
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+game scripting, not cpython for general purpose programming.**
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+
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++ For syntax and semantics, pkpy is designed to be as close to cpython as possible.
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++ For ecosystem and others, pkpy is not compatible with cpython.
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+
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+pkpy supports most of the syntax and semantics of python.
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+For performance and simplicity, some features are not implemented, or behave differently.
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+
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+## Unimplemented features
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+1. `**kwargs` in function definition.
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+2. `__getattr__` and `__setattr__`.
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+3. Descriptor protocol `__get__` and `__set__`. However, `@property` is implemented.
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+4. `__slots__` in class definition.
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+5. `import` module from a directory with `__init__.py`.
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+6. One element tuple. `(1,)` is not supported.
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+7. Unpacking in `list` and `dict` literals, i.e. `[1, 2, *a]`.
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+8. Access the exception object in try..except.
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+
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+## Different behaviors
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+1. positional and keyword arguments are strictly evaluated.
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+2. When a generator is exhausted, `StopIteration` is returned instead of raised.
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+3. `++i` and `--j` is an increment/decrement statement, not an expression.
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