This document discusses feature toggling and controlled rollouts, including A/B testing. It then introduces Hanoi, a Python library for feature toggling that allows enabling functionalities for a subset of users. Hanoi stores feature toggle data in a backend and supports Python 2.x, 3.x and PyPy interpreters.

1. _HANOI
A PYTHON LIBRARY FOR FEATURE TOGGLING
@JUANDEBRAVO
#TEFCONF2016

2. WHAT IS THIS ABOUT?
“ENABLE FUNCTIONALITIES TO A
SUBSET OF USERS”

3. WHAT IS THIS ABOUT?
• A/B TESTING
• FEATURE TOGGLES
• CONTROLLED ROLLOUT

4. A/B TESTING

5. A/B TESTING
• DEFINE THE HYPOTHESIS
• WHICH USERS WILL BE PART OF THE EXPERIMENT?
• HOW WILL YOU MEASURE?
• FOR HOW LONG DO YOU NEED TO RUN THE
EXPERIMENT?
QUESTIONS BEFORE YOU START

6. FEATURE TOGGLES

7. FEATURE TOGGLES
• DO YOU NEED IT?
• DO YOU KNOW THAT A FEATURE TOGGLE COULD
BE CONSIDERED TECHNICAL DEBT?
(HTTPS://DZONE.COM/ARTICLES/FEATURE-
TOGGLES-ARE-ONE-WORST)
• IT INCREASES TESTING MATRIX
QUESTIONS BEFORE YOU START

8. CONTROLLED ROLLOUT

9. CONTROLLED ROLLOUT
• DEPLOY TWO VERSIONS IN PARALLEL
• HOW TO ROUTE TRAFFIC TO THE RELEVANT
BRANCH
• ENSURE EVERY USER IS HANDLED IN ONE
BRANCH ONLY
QUESTIONS BEFORE YOU START

10. HANOI
• “PYTHON LIBRARY TO TOGGLE ON/OFF FEATURES USING A BACKEND AS DATA STORE”
• WHY THIS FUNCTIONALITY? PORT OF ROLLOUT GEM (RUBY) BY JAMES GOLICK (R.I.P.)
• HTTPS://GITHUB.COM/JUANDEBRAVO/HANOI
• 5 STARS (THANKS EDU AND GUIDO!)
• 3 PYTHON INTERPRETERS (2.X, 3.X, PYPY)
• 4 RELEASES
• 2 WATCHERS

11. HANOI

12. HANOI

13. HANOI