Scrapy - A fast high-level screen scraping and web crawling framework.
Web Content Extracting
newspaper - News extraction, article extraction and content curation in Python.
Scientific Computing
scipy - An open-source software for mathematics, science, and engineering. statistics, optimization, integration, linear algebra, Fourier transforms, signal and image processing, ODE solvers, and more.
Frameworks
Django - The most popular full featured web framework in Python.
djangopackages - Excellent 3rd party django package collections.
Utilities
Interactive Interpreter
IPython - A rich toolkit to help you make the most out of using Python interactively.
Environment
virtualenv - A tool to create isolated Python environments.