Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Exceptional Exceptions - EuroPython 2019
Search
Mario Corchero
July 11, 2019
Programming
1
120
Exceptional Exceptions - EuroPython 2019
Mario Corchero
July 11, 2019
Tweet
Share
More Decks by Mario Corchero
See All by Mario Corchero
Linux & Python
mariocj89
0
85
Exceptional Exceptions
mariocj89
2
140
unittest.Mock in detail
mariocj89
0
220
Mocks: Successfully isolating the snake
mariocj89
1
91
Effortless logging: A deep dive into Python logging module
mariocj89
0
770
PyLondinium18 - London python Meetup
mariocj89
0
67
It's time for datetime
mariocj89
0
76
Pythons in the tower of babel
mariocj89
0
100
Other Decks in Programming
See All in Programming
iOSでSVG画像を扱う
kishikawakatsumi
0
160
Catch Up: Go Style Guide Update
andpad
0
250
Vueのバリデーション、結局どれを選べばいい? ― 自作バリデーションの限界と、脱却までの道のり ― / Which Vue Validation Library Should We Really Use? The Limits of Self-Made Validation and How I Finally Moved On
neginasu
2
1.4k
PHPに関数型の魂を宿す〜PHP 8.5 で実現する堅牢なコードとは〜 #phpcon_hiroshima / phpcon-hiroshima-2025
shogogg
1
330
デミカツ切り抜きで面倒くさいことはPythonにやらせよう
aokswork3
0
260
Domain-centric? Why Hexagonal, Onion, and Clean Architecture Are Answers to the Wrong Question
olivergierke
3
960
Developer Joy - The New Paradigm
hollycummins
1
360
開発組織の戦略的な役割と 設計スキル向上の効果
masuda220
PRO
8
1.5k
What Spring Developers Should Know About Jakarta EE
ivargrimstad
0
450
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
280
AkarengaLT vol.38
hashimoto_kei
1
120
Google Opalで使える37のライブラリ
mickey_kubo
3
140
Featured
See All Featured
Become a Pro
speakerdeck
PRO
29
5.6k
The Language of Interfaces
destraynor
162
25k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
359
30k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
9
930
Done Done
chrislema
185
16k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
37
2.6k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
21
1.2k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.6k
Statistics for Hackers
jakevdp
799
220k
Thoughts on Productivity
jonyablonski
70
4.9k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
9
990
Transcript
© 2019 Bloomberg Finance L.P. All rights reserved. Exceptional Exceptions:
How to properly raise, handle and create them EuroPython 2019 July 11, 2019 Mario Corchero @mariocj89
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Let’s just raise an exception, right?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Let’s just raise an exception, right?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Let’s go step by step
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. How to capture an exception
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. What can go in the except?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. What can go in the except?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Using finally
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Using else
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Order of execution?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. What about returning in the middle?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions Use exc_info to include exception information
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions Errors should never pass silently. Unless explicitly silenced.
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions But... When I have...
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions But... What if I know...
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Logging exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Scoping of the except See PEP 3110. In short: exception -> traceback -> stack frame -> exception
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Raise it!
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. The tricky, raise within except
© 2018 Bloomberg Finance L.P. All rights reserved. The tricky,
raise within except
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Reraise
© 2018 Bloomberg Finance L.P. All rights reserved. Reraise
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Reraise
© 2018 Bloomberg Finance L.P. All rights reserved. Reraise
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Chaining exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. Chaining exceptions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Eliding previous exception
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Eliding previous exception
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. False friends: NotImplemented Passes without printing. 37,762 hits in GitHub as of July 2019.
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Raise on a thread?
© 2018 Bloomberg Finance L.P. All rights reserved. Raise on
a thread?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. The exception hierarchy Check https://docs.python.org/3/library/exceptions.html
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Exception attributes
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Exception attributes
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Exception attributes
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Creating new classes
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Creating new classes
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Exception hierarchy
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Multiple inheritance • Decimal: • Requests:
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Can I use Error codes?
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Conclusions
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Extra content!
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. New magic in 3.8
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. New magic in 3.8
© 2019 Bloomberg Finance L.P. All rights reserved. Cycles when
reraising
© 2019 Bloomberg Finance L.P. All rights reserved. Cycles when
reraising
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Returns in finally
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Returns in finally
© 2018 Bloomberg Finance L.P. All rights reserved. © 2019
Bloomberg Finance L.P. All rights reserved. Returns in finally
© 2019 Bloomberg Finance L.P. All rights reserved. Thank you!
Questions?? Also, ask me about travelling to Extremadura!