Upgrade to Pro — share decks privately, control downloads, hide ads and more …
Sign up for free

Exceptional Exceptions - EuroPython 2019

Sponsored · SiteGround - Reliable hosting with speed, security, and support you can count on. →
Avatar for Mario Corchero Mario Corchero
July 11, 2019
Programming
150
1

Exceptional Exceptions - EuroPython 2019

Avatar for Mario Corchero

Mario Corchero

July 11, 2019

More Decks by Mario Corchero

See All by Mario Corchero
Linux & Python
Avatar for Mario Corchero mariocj89
0
120
Exceptional Exceptions
Avatar for Mario Corchero mariocj89
2
180
unittest.Mock in detail
Avatar for Mario Corchero mariocj89
0
260
Mocks: Successfully isolating the snake
Avatar for Mario Corchero mariocj89
1
130
Effortless logging: A deep dive into Python logging module
Avatar for Mario Corchero mariocj89
0
850
PyLondinium18 - London python Meetup
Avatar for Mario Corchero mariocj89
0
83
It's time for datetime
Avatar for Mario Corchero mariocj89
0
120
Pythons in the tower of babel
Avatar for Mario Corchero mariocj89
0
150

Other Decks in Programming

See All in Programming
AI-Powered Domain-Driven Design
Avatar for Alberto Brandolini ziobrando
0
380
高橋メソッドでCVE解説シリーズ 〜CVE-2026-112816〜
Avatar for Hakkadaikon hakkadaikon
0
200
Vue.jsで作る空間解析アプリとCapacitorプラグインのData Bridge
Avatar for Hal hal_spidernight
1
160
JIS keyboard support in Omarchy
Avatar for LEF lef237
0
180
SFCで実現する病院・医療システムの動的組み立て式UI
Avatar for kouki.miura koukimiura
1
160
Event is what happens
Avatar for MOROHASHI Kyosuke moro
2
3.2k
クラウドゲーミングのパフォーマンス最適化に挑む / Cloud Gaming Performance Tuning
Avatar for viviON vivion
0
320
全ての永続トークンを、生まれる前に消し去りたい！
Avatar for sylph01 sylph01
3
1.7k
Performance Optimization With LLMs
Avatar for xLeitix xleitix
0
240
[Dev Group Paris Octobre 26] Agentforce, SIforce, Claudeforce, Slackbot… on s'y retrouve ?
Avatar for Nathan Abondance nabondance
0
130
複雑なUIコンポーネントとの ⻑い付き合い⽅：波及するバグからテスト戦略を経て、安全な再設計へ
Avatar for masahiko.asai mixplace
0
510
コーディング自動化の次へ。人の介入をゼロにするファクトリーとサポートAIによる実践
Avatar for Seiji Takahashi timakin
5
5.1k

Featured

See All Featured
Designing for Timeless Needs
Avatar for Cassini Nazir cassininazir
1
550
Automating Front-end Workflow
Avatar for Addy Osmani addyosmani
1370
210k
Accessibility Awareness
Avatar for Sarah Abderemane sabderemane
1
280
Everyday Curiosity
Avatar for Cassini Nazir cassininazir
0
390
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
Avatar for Tammy Everts tammyeverts
11
1.1k
Build your cross-platform service in a week with App Engine
Avatar for Jose L jlugia
234
19k
Build The Right Thing And Hit Your Dates
Avatar for Maggie C. maggiecrowley
39
3.5k
The Hidden Cost of Media on the Web [PixelPalooza 2025]
Avatar for Tammy Everts tammyeverts
2
560
30 Presentation Tips
Avatar for Ian Lurie portentint
PRO
1
460
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
Avatar for Vitaly Friedman smashingmag
254
23k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.7k
From π to Pie charts
Avatar for Rasagy Sharma rasagy
1
430

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!