Let’s identify and clear the confusion about some common terms related to Python.
- The official, reference implementation of Python, with two major releases: Python 2 and Python 3. It works as a Python source code interpreter and it is written in C. It is maintained by the Python Software Foundation.
- A widely used optimising Python-to-C compiler. The Cython language is a superset of the Python language that additionally supports calling C functions and declaring C types on variables and class attributes. This allows the compiler to generate very efficient C code from Cython code.
There are also some other stable and common Python implementations.
- Written in Java for the JVM.
- Written in C# for the .NET and Mono platform.
- Python implementation in Python. Thanks to its Just-In-Time compiler, Python programs often run faster on PyPy.
Meanwhile, PyPI does not refer to another implementation of Python. It stands for Python Package Index - the official third-party software repository for the Python programming language.
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