Prior work

[mrocklin]

What else in the python ecosystem exists?

http://stackoverflow.com/questions/20131077/sampling-module-for-python

[eriknw]

Wow, some very recent projects (two days, four days, and three months old, respectively) that focus on command line usage:

https://github.com/RyanBalfanz/reservoir-sampling-cli
https://github.com/keisukefukuda/streamsampler
https://github.com/paulgb/subsample