Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Exceptional Exceptions - EuroPython 2019

Avatar for Mario Corchero Mario Corchero
July 11, 2019
Programming
1
120

Exceptional Exceptions - EuroPython 2019

Avatar for Mario Corchero

Mario Corchero

July 11, 2019
Tweet

More Decks by Mario Corchero

See All by Mario Corchero
Linux & Python
Avatar for Mario Corchero mariocj89
0
85
Exceptional Exceptions
Avatar for Mario Corchero mariocj89
2
140
unittest.Mock in detail
Avatar for Mario Corchero mariocj89
0
220
Mocks: Successfully isolating the snake
Avatar for Mario Corchero mariocj89
1
91
Effortless logging: A deep dive into Python logging module
Avatar for Mario Corchero mariocj89
0
770
PyLondinium18 - London python Meetup
Avatar for Mario Corchero mariocj89
0
67
It's time for datetime
Avatar for Mario Corchero mariocj89
0
76
Pythons in the tower of babel
Avatar for Mario Corchero mariocj89
0
100

Other Decks in Programming

See All in Programming
iOSでSVG画像を扱う
Avatar for Kishikawa Katsumi kishikawakatsumi
0
160
Catch Up: Go Style Guide Update
Avatar for ANDPAD inc 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
Avatar for ねぎなす 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
Avatar for shogogg 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
Avatar for aokirishima aokswork3
0
260
Domain-centric? Why Hexagonal, Onion, and Clean Architecture Are Answers to the Wrong Question
Avatar for Oliver Drotbohm olivergierke
3
960
Developer Joy - The New Paradigm
Avatar for Holly Cummins 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
Avatar for 増田 亨 masuda220
PRO
8
1.5k
What Spring Developers Should Know About Jakarta EE
Avatar for ivargrimstad 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
Avatar for kasacchiful kasacchiful
0
280
AkarengaLT vol.38
Avatar for hashimoto-kei hashimoto_kei
1
120
Google Opalで使える37のライブラリ
Avatar for MIKIO KUBO mickey_kubo
3
140

Featured

See All Featured
Become a Pro
Avatar for Speaker Deck speakerdeck
PRO
29
5.6k
The Language of Interfaces
Avatar for Des Traynor destraynor
162
25k
CSS Pre-Processors: Stylus, Less & Sass
Avatar for Bermon Painter bermonpainter
359
30k
Intergalactic Javascript Robots from Outer Space
Avatar for Vicent Martí tanoku
272
27k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
Avatar for Addy Osmani addyosmani
9
930
Done Done
Avatar for chrislema chrislema
185
16k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
Avatar for Eileen M. Uchitelle eileencodes
37
2.6k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.2k
Why You Should Never Use an ORM
Avatar for John Nunemaker jnunemaker
PRO
59
9.6k
Statistics for Hackers
Avatar for Jake VanderPlas jakevdp
799
220k
Thoughts on Productivity
Avatar for Jon Yablonski jonyablonski
70
4.9k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
Avatar for Irina Nazarova irinanazarova
9
990

Transcript

  1. © 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

  2. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Let’s just raise an exception, right?

  3. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Let’s just raise an exception, right?

  4. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Let’s go step by step

  5. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. How to capture an exception

  6. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. What can go in the except?

  7. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. What can go in the except?

  8. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Using finally

  9. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Using else

  10. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Order of execution?

  11. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. What about returning in the middle?

  12. © 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

  13. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  14. © 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.

  15. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  16. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions But... When I have...

  17. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions But... What if I know...

  18. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  19. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  20. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  21. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Logging exceptions

  22. © 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

  23. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Raise it!

  24. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. The tricky, raise within except

  25. © 2018 Bloomberg Finance L.P. All rights reserved. The tricky,

    raise within except

  26. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Reraise

  27. © 2018 Bloomberg Finance L.P. All rights reserved. Reraise

  28. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Reraise

  29. © 2018 Bloomberg Finance L.P. All rights reserved. Reraise

  30. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Chaining exceptions

  31. © 2018 Bloomberg Finance L.P. All rights reserved. Chaining exceptions

  32. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Eliding previous exception

  33. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Eliding previous exception

  34. © 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.

  35. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Raise on a thread?

  36. © 2018 Bloomberg Finance L.P. All rights reserved. Raise on

    a thread?

  37. © 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

  38. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Exception attributes

  39. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Exception attributes

  40. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Exception attributes

  41. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Creating new classes

  42. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Creating new classes

  43. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Exception hierarchy

  44. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Multiple inheritance • Decimal: • Requests:

  45. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Can I use Error codes?

  46. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Conclusions

  47. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Extra content!

  48. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. New magic in 3.8

  49. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. New magic in 3.8

  50. © 2019 Bloomberg Finance L.P. All rights reserved. Cycles when

    reraising

  51. © 2019 Bloomberg Finance L.P. All rights reserved. Cycles when

    reraising

  52. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Returns in finally

  53. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Returns in finally

  54. © 2018 Bloomberg Finance L.P. All rights reserved. © 2019

    Bloomberg Finance L.P. All rights reserved. Returns in finally

  55. © 2019 Bloomberg Finance L.P. All rights reserved. Thank you!

    Questions?? Also, ask me about travelling to Extremadura!