| Syntaxish: syntax and language · changes and py2/3 · importing, modules, packages · iterable stuff · concurrency
IO: networking and web · filesystem
Data: Numpy, scipy · pandas, dask · struct, buffer, array, bytes, memoryview · Python database notes
Image, Visualization: PIL · Matplotlib, pylab · seaborn · bokeh · plotly
Concurrency (threads, processes, more) · joblib · pty and pexpect
Stringy: strings, unicode, encodings · regexp · command line argument parsing · XML
date and time
speed, memory, debugging, profiling
| This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits.
Note that YAML can be convenient for this.
Also commonly used is the ini-style format that can be parsed by ConfigParser (standard library), and by libraries like initools (similar, simpler to use).