mongoexport is WAY FASTER than MongoDB Compass' Export Collection UI, but...

OS: SELECT(2), POLL(2), and their variants

URL Parameters / URL Query / Tornado get_argument()

Closest Pair of Points

Python: Socket Programming 101

A socket is like an endpoint... or a line segment

Python: synchronization primitives

Python: sharing states between processes

Middleman Patterns: Adapter / Proxy / Decorator

Visitor Pattern Revisited