How to format numbers by (several different) locales in Python 3

Question

Is there a correct way to format numbers by locale (getting the correct decimal separator) without modifying global state? This is for text generation server-side, so setlocale is not a good idea, and Babel does not yet support Python 3

Answer 1

Unfortunately, the locale module gets and sets global state. This is intrinsic to the design of locale.

The various workarounds include setting locks or calling a subprocess as a service.