Plus, in this week’s Installer: a new Mario Tennis, Sony’s great new buds, a wild time-travel movie, and much more.

Python -O won’t magically make every script faster, but in the right workloads it’s a free win—here’s how to test it safely.

Why write ten lines of code when one will do? From magic variable swaps to high-speed data counting, these Python snippets will transform your code.