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This is probably a really stupid question but whats the difference between 'PyPy' and 'PyPI'? Are they the same thing?
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PyPy is a drop-in replacement for the stock Python interpreter, CPython. Whereas CPython compiles Python to intermediate bytecode that is then interpreted by a virtual machine, PyPy uses just-in-time (JIT) compilation to translate Python code into machine-native assembly language.
PyPy aims to provide a common translation and support framework for producing implementations of dynamic languages, emphasizing a clean separation between language specification and implementation aspects.
pip is the de facto package manager in the Python world. It can install packages from many sources, but PyPI is the primary package source where it's used. When installing packages, pip will first resolve the dependencies, check if they are already installed on the system, and, if not, install them.
PyPy uses a technique known as meta-tracing, which transforms an interpreter into a tracing JIT (just-in-time) compiler which is a way of executing code that involves compilations during runtime. It not only runs faster but it also has better memory usage than Python.
PyPy is an alternative implementation of python:
PyPy is a fast, compliant alternative implementation of the Python language (2.7.13 and 3.5.3). It has several advantages and distinct features: Speed: thanks to its Just-in-Time compiler, Python programs often run faster on PyPy. (What is a JIT compiler?) “If you want your code to run faster, you should probably just use PyPy.” — Guido van Rossum (creator of Python) Memory usage: memory-hungry Python programs (several hundreds of MBs or more) might end up taking less space than they do in CPython. Compatibility: PyPy is highly compatible with existing python code. It supports cffi and can run popular python libraries like twisted and django. Stackless: PyPy comes by default with support for stackless mode, providing micro-threads for massive concurrency. As well as other features.
PyPi is the repository for python packages, modules and libraries that you can install.
The Python Package Index is a repository of software for the Python programming language. There are currently 120970 packages
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