mirror of
https://github.com/pocketpy/pocketpy
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43 lines
2.0 KiB
Markdown
43 lines
2.0 KiB
Markdown
---
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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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[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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## The design goal
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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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+ 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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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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The easiest way to test a feature is to [try it on your browser](https://pocketpy.dev/static/web/).
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## Unimplemented features
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1. Descriptor protocol `__get__` and `__set__`. However, `@property` is implemented.
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2. `__slots__` in class definition.
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3. `else` clause in try..except.
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4. Inplace methods like `__iadd__` and `__imul__`.
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5. `__del__` in class definition.
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6. Multiple inheritance.
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## Different behaviors
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1. positional and keyword arguments are strictly evaluated.
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2. `++i` and `--j` is an increment/decrement statement, not an expression.
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3. `int` does not derive from `bool`.
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4. `int` is 64-bit. You can use `long` type explicitly for arbitrary sized integers.
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5. `__ne__` is not required. Define `__eq__` is enough.
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6. Raw string cannot have boundary quotes in it, even escaped. See [#55](https://github.com/pocketpy/pocketpy/issues/55).
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7. In a starred unpacked assignment, e.g. `a, b, *c = x`, the starred variable can only be presented in the last position. `a, *b, c = x` is not supported.
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8. A `Tab` is equivalent to 4 spaces. You can mix `Tab` and spaces in indentation, but it is not recommended.
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9. `%`, `&`, `//`, `^` and `|` for `int` behave the same as C, not python.
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10. `str.split` and `str.splitlines` will remove all empty entries.
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11. `__getattr__`, `__setattr__` and `__delattr__` can only be set in cpp.
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