# Comparison with CPython

cpython is the reference implementation of the Python programming language. It is written in C and is the most widely used implementation of Python.

# The design goal

pkpy aims to be an alternative to lua for game scripting, not cpython for general purpose programming.

• For syntax and semantics, pkpy is designed to be as close to cpython as possible.
• For ecosystem and others, pkpy is not compatible with cpython.

pkpy supports most of the syntax and semantics of python. For performance and simplicity, some features are not implemented, or behave differently. The easiest way to test a feature is to try it on your browser.

# Unimplemented features

1. Descriptor protocol __get__ and __set__. However, @property is implemented.
2. __slots__ in class definition.
3. else clause in try..except.
4. Inplace methods like __iadd__ and __imul__.
5. __del__ in class definition.
6. Multiple inheritance.

# Different behaviors

1. positional and keyword arguments are strictly evaluated.
2. int does not derive from bool.
3. int is 64-bit.
4. Raw string cannot have boundary quotes in it, even escaped. See #55.
5. 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.
6. A Tab is equivalent to 4 spaces. You can mix Tab and spaces in indentation, but it is not recommended.
7. %, &, //, ^ and | for int behave the same as C, not python.
8. str.split and str.splitlines will remove all empty entries.
9. A return, break, continue in try/except block will make the finally block not executed.