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NINA ZAKHARENKO
CODE REVIEW
SKILLS FOR
PYTHONISTAS
@NNJA
bit.ly/
pycodereviews
LIVETWEET
USE #EUROPYTHON
@NNJA
WHAT WE'LL LEARN TODAY [1/2]
> What are the proven benefits of
review?
> Setting standards
> Time saving tools and automation
options for Python
@nnja
WHAT WE'LL LEARN TODAY [2/2]
> How to review code helpfully
> How to submit PRs for maximum
impact
> Use code review to build a
stronger team
@nnja
WHAT WILL YOU TAKE AWAY FROM THIS TALK?
> Novice - Comprehensive overview of
code review best practices
> Intermediate - Tooling &
automation
> Advanced - Hardest part – the
people factor
@nnja
NOT ONE SIZE FITS ALL!
> team size
> 2 vs 10
> product type
> agency vs in-house vs open source
@nnja
NOT ONE SIZE FITS ALL!
> defect tolerance
> jet engines vs mobile games
@nnja
WHY CODE REVIEW?
@nnja
CODE REVIEWS CAN
BE FRUSTRATING
@nnja
APPARENT CODE REVIEW FRUSTRATIONS
> Adds time demand
> Adds process
> Can bring up team tensions
> “smart” devs think they don’t need
it
!
@nnja
CODE REVIEW BENEFITS
@nnja
FIND BUGS & DESIGN FLAWS
> Design flaws & bugs can be identified
and remedied before the code is
complete
> Case Studies on Review5
:
> ➡ bug rate by 80%
> productivity by 15%
5 
blog.codinghorror.com/code-reviews-just-do-it/
@nnja
THE GOAL IS TO FIND
BUGS BEFORE YOUR
CUSTOMERS DO
@nnja
SHARED OWNERSHIP & KNOWLEDGE
> We’re in this together
> No developer is the only expert
@nnja
LOTTERY FACTOR
New Yorker: Can Andy Byford Save the Subways?
CODE REVIEW BENEFITS?
> Find Bugs
> Shared Ownership
> Shared Knowledge
> Reduce "Lottery Factor"
@nnja
HOW?@nnja
CONSISTENT CODE
> Your code isn’t yours, it belongs
to your company
> Code should fit your company’s
expectations and style (not your
own)
> Reviews should encourage
consistency for code longevity
@nnja
CODE REVIEWS NEED TO BE UNIVERSAL &
FOLLOW GUIDELINES
> Doesn’t matter how senior / junior
you are
> Only senior devs reviewing ==
bottleneck
> Inequality breeds dissatisfaction
@nnja
STYLE GUIDE
> Distinguishes personal taste from
opinion
> Should be agreed upon beforehand
> Go beyond PEP8
> See: Google's pyguide.md or plone
styleguide
@nnja
FORMATTERS
- autopep8
- Black
- YAPF
!
BLACK
DEMO @: black.now.sh
github.com/jpadilla/black-online
VS Code> settings:
> "editor.formatOnSave": true
> "python.formatting.provider": "black"
> "python.formatting.blackArgs": ["--line-
length", "100"]
> VS Code Black support docs
@nnja
CONSISTENT CODE IS EASIER TO MAINTAIN
BY A TEAM
@nnja
CODE REVIEW IS DONE BY
YOUR PEERS & NOT MANAGEMENT
@nnja
DON’T POINT FINGERS!
@nnja
WHEN CODE REVIEWS ARE POSITIVE,
DEVELOPERS
DON’T EXPECT THEIR
CHANGES TO BE REVIEWED,
THEY WANT THEIR
CHANGES TO BE REVIEWED.
@nnja
LET'S REVIEW: CODE REVIEW
FUNDAMENTALS
> Universal code review
> Performed by Peers
> Style guides & formatters for
consistency
> No blame culture
@nnja
HOW SHOULD
WE CODE
REVIEW? @nnja
BE A GREAT
SUBMITTER
@nnja
DON’T GET RUBBER-STAMPED.
@nnja
DON’T BE CLEVER.
READABILITY COUNTS!
@nnja
GOOD CODE IS LIKE A GOOD JOKE.
IT NEEDS NO EXPLANATION.
- RUSS OLSEN
@nnja
STAGES OF REVIEW
> 0: before PR submission
> 1: PR submitted
> 2: (optional) work in progress PR
(30-50%)
> 3: review almost done (90-100%)
> 4: review completed
@nnja
STAGE 0:BEFORE SUBMISSION
@nnja
PROVIDE CONTEXT (THE WHY)
> What was the motivation for
submitting this code?
> Link to the underlying ticket/issue
> Document why the change was needed
> For larger PRs, provide a changelog
> Point out any side-effects
@nnja
YOU ARE THE
PRIMARY REVIEWER
> Review your code with the same level of
detail you would give giving reviews.
> Anticipate problem areas.
@nnja
THE PRIMARY REVIEWER
> Make sure your code works, and is
thoroughly tested.
> Don’t rely on others to catch your
mistakes.
@nnja
BEFORE SUBMITTING, TRY A CHECKLIST
@nnja
☑ SMALL STUFF> Did you check for reusable code or
utility
methods?
> Did I remove debugger statements?
> Are there clear commit messages?
@nnja
☑ BIG STUFF> Is my code secure?
> Will it scale?
> Is it maintainable?
> Is it resilient against outages?
Tip: Read The Checklist Manifesto
@nnja
STAGE 1:
SUBMITTED@nnja
YOU’RE STARTING A CONVERSATION
> Don’t get too attached to your
code before the review process
> Anticipate comments and feedback
> Acknowledge you will make mistakes
@nnja
STAGE 2:
(OPTIONAL)
WORK IN PROGRESS@nnja
SUBMIT WORK IN PROGRESS PULL REQUESTS
> Open them your code is 30-50% done
> Good idea for bigger features
> Don’t be afraid of showing
incomplete, incremental work
@nnja
WHEN CODE IS WORK IN PROGRESS
> Feedback to expect:
> Architectural issues
> Problems with overall design
> Design pattern suggestions
@nnja
STAGE 3:ALMOST DONE@nnja
WHEN CODE IS ALMOST DONE
> Feedback to expect:
> Nit Picks
> Variable Names
> Documentation & Comments
> Small Optimizations
@nnja
ONE REVIEW PER PR
> Solving multiple problems? Break
them up into multiple PRs for ease
of review.
> Solved an unrelated problem? Make
a new PR with a separate diff
@nnja
PREVENT REVIEWER BURNOUT
> Reviews lose value when they’re
more than 500 lines of code1
> Keep them small & relevant
> If a big PR is unavoidable, give
the reviewer extra time
1 
https://www.microsoft.com/en-us/research/wp-content/uploads/2016/02/
bosu2015useful.pdf
@nnja
✔ CHECK CODE
WITH AUTOMATED TOOLS
@nnja
✔ LINTER
@nnja
> Coding standard
> Error detection
> Refactoring help
> IDE & editor integration
@nnja
!
PYLINT RULE: trailing-comma-tuple
foo = (1,
3,
4,
)
bar = 2,
@nnja
USE VULTURE.PY
TO FIND DEAD OR UNREACHABLE CODE
$ pip install vulture
$ vulture script.py package/
or
$ python -m vulture script.py package/
github.com/jendrikseipp/vulture
Sample code
def foo():
print("foo")
def bar():
print("bar")
def baz():
print("baz")
foo()
bar()
Run vulture.py
› python -m vulture foo.py
foo.py:7: unused function 'baz' (60% confidence)
@nnja
GIT PRE-COMMIT HOOKS
> run linter
> check syntax
> check for TODOs, debugger statements,
unused imports
> enforce styling (autopep8, black formatter,
sort imports, etc)
> option to reject commit if conditions don't
pass
@nnja
pre-commit.com
@nnja
pre-commit.com
> autopep8-wrapper - Runs autopep8 over source
> flake8 and pyflakes - Run flake8 or pyflakes
on source
> check-ast - Check whether files contain
valid python
> debug-statements - Check for debugger
imports and breakpoint() calls
@nnja
✔ TESTS> Write them!
> Don’t know code health if tests
are failing
> Tests identify problems
immediately
@nnja
@nnja
✔ CONTINUOUS INTEGRATION
CPYTHON USES VSTS
@nnja
✔ coverage.py
% OF CODE EXECUTED WHEN RUNNING A TEST SUITE
@nnja
✔ COVERAGE
> Coverage tools integrate into GitHub
> coverage.py
> coveralls.io
@nnja
STAGE 4:REVIEW COMPLETE
@nnja
BE RESPONSIVE> Reply to every comment
> Common Responses:
> Resolved
> Won’t Fix
> If you won’t fix, make sure you’ve come to
a mutual understanding with the reviewer
@nnja
IT’S STILL A CONVERSATION
If there were comments, let your
reviewer know when you’ve pushed
changes and are ready to be re-
reviewed.
@nnja
DON’T BIKE-SHED> bikeshed.com
> back & forth > 3 times? step away
from the keyboard
> talk instead!
> record the results of the
conversation in the PR
@nnja
VS CODE LIVE SHARE
Download Extension
FIGHT FOR WHAT YOU BELIEVE, BUT
GRACEFULLY ACCEPT DEFEAT.
@nnja
DON’T TAKE FEEDBACK PERSONALLY.
IT’S AN OPPORTUNITY FOR GROWTH.
@nnja
HOW TO BE A GREAT SUBMITTER?
> Provide the why (context!)
> Review your own code
> Expect conversation
> Submit in progress work
@nnja
HOW TO BE A GREAT SUBMITTER?
> Use automated tools
> Be responsive
> Accept defeat
@nnja
#1: BE A GREAT
REVIEWER
@nnja
@nnja
BE OBJECTIVE
“THIS METHOD IS MISSING A DOCSTRING”
INSTEAD OF
“YOU FORGOT TO WRITE A DOCSTRING”
@nnja
ASK QUESTIONS DON’T GIVE ANSWERS
> “Would it make more sense if... ?”
> “Did you think about... ? ”
@nnja
OFFER SUGGESTIONS
> “It might be easier to...”
> “We tend to do it this way...”
@nnja
AVOID THESE TERMS
> Simply
> Easily
> Just
> Obviously
> Well, actually...
@nnja
... NOW, SIMPLY
@nnja
HAVE CLEAR FEEDBACK
> Strongly support your opinions
> Share How & Why
> Link to supporting documentation,
blog post, or stackoverflow
examples
@nnja
THIS IS NOT CLEAR FEEDBACK
@nnja
COMPLIMENT GOOD WORK AND
GREAT IDEAS
@nnja
DON'T BE A PERFECTIONIST
@nnja
DON’T BE A PERFECTIONIST
> For big issues, don’t let perfect
get in the way of perfectly
acceptable.
> Prioritize what’s important to
you.
> Usually 90% there is good enough.
@nnja
IT’S OK TO NIT-PICK
> Syntax Issues
> Spelling Errors
> Poor Variable Names
> Missing corner-cases
> Specify: Are your nitpicks blocking merge?
Save the nit-picks for last, after any pressing
architecture, design, or other large scale issues
have been addressed.
@nnja
Don't burn out. Studies show reviewer should look at
200-400 lines of code at a time for maximum impact2
.
2 
https://smartbear.com/learn/code-review/best-practices-for-peer-code-review/
Limit reviews to 400 lines in 60 mins
to maximize effectiveness3
.
3 
https://smartbear.com/learn/code-review/best-practices-for-peer-code-review/
TRY TO DO REVIEWS IN 24-48 HOURS
HOW CAN WE BE A GREAT REVIEWER?
> Have Empathy
> Watch your Language
> Have Clear Feedback
> Give Compliments
@nnja
HOW CAN WE BE A GREAT REVIEWER?
> Don’t be a perfectionist
> Avoid Burn Out
> Complete in 24-48 hours
@nnja
CODE
REVIEWS
BUILD A
STRONGER
TEAM
@nnja
FIRST DAY VIBES...
@nnja
NEWBIES> Not everyone has experience being
reviewed.
> Remember what it felt like when
you introduced the process.
> Ease into it!
@nnja
ONBOARDING> The first submitted PR is the hardest
> The first review done is challenging too
> Start by reading recently completed reviews
> First code review should be small
> Share the style guide
@nnja
EVERYONE’S A REVIEWER
> Junior devs start by doing pair-
reviews with a more experienced
teammate.
> Use it as a mentorship
opportunity.
@nnja
HIRING SENIOR ENGINEERS IS HARD.
YOU CAN HIRE JUNIOR ENGINEERS,
AND GROW THEM
INTO FUNCTIONAL PRODUCTIVE PARTS OF
YOUR TEAM.
- SASHA LAUNDY
@nnja
IF YOU’RE NOT DOING CODE REVIEWS,
YOU’RE MISSING A BIG OPPORTUNITY.
@nnja
REMEMBER...> Allocate the time
> Develop, don’t force the process
> Not one size fits all
> Or a one stop fix
> Use in addition to tests, QA, etc for
maximum impact
@nnja
I'VE BECOME A MUCH BETTER PROGRAMMER
BY PARTICIPATING IN CODE REVIEWS
@nnja
WHAT DID WE
LEARN?
@nnja
@nnja
REVIEWS DECREASE WTFS/M
BY INCREASING CODE QUALITY LONG TERM
@nnja
LESS WTFS ➡
HAPPIER DEVS!
@nnja
THANKS!
SLIDES: bit.ly/
pycodereviews
aka.ms/python
@nnja
(Additional resources on
next slides)
RESOURCES & ADDITIONAL READING
> Microsoft Study on Effective Code Review
> Code Reviews: Just do it
> Code Project - Code Review Guidelines
> Great Example Checklist
> Best Practices for Code Review
> Rebecca's Rules for Constructive Code Review
> My Big Fat Scary Pull Request
> The Gentle Art of Patch Review - Sage Sharp
> Watch: Raymond Hettinger - Beyond PEP8
@nnja
EXAMPLE STYLE GUIDES
> Python
> Plone
Google has many good, but strict style guides
at: https://github.com/google/styleguide
Doesn't matter which one you use.
Pick one and stick with it.
@nnja

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