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

Exceptional Exceptions - EuroPython 2019

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
110
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
120
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
81
It's time for datetime
Avatar for Mario Corchero mariocj89
0
120
Pythons in the tower of babel
Avatar for Mario Corchero mariocj89
0
140

Other Decks in Programming

See All in Programming
Everything will be SERVERLESS — 信じて運用した10年の経験値 / Everything Will be Serverless — Lessons Learned from 10 Years of Operational Experience
Avatar for shiro seike seike460
PRO
1
970
外から家のPCの電源入れたい！をＰＨＰで解決する
Avatar for かわしも（Shimokawa Shion） kawashimo0
1
130
sbt 2.0: takeoff
Avatar for Eugene Yokota eed3si9n
0
140
wkhtmltopdfの次どうするか問題2026
Avatar for Shinichi Maeshima willnet
2
1.9k
Vue Fes Japan の “作る側”に関わってみて
Avatar for Naoki Haba naokihaba
0
150
Workers Cache を知る
Avatar for syumai syumai
0
350
Augmenting AI with the Power of Jakarta EE
Avatar for ivargrimstad ivargrimstad
0
550
Apple Intelligence を用いた個人情報誤送信防止、及びユーザーリクエスト体験の改善について
Avatar for Yuki Kuwashima yukiny
0
330
Jetpack Compose Mechanisms
Avatar for Jaewoong skydoves
2
710
最近”作らせてる” ローカルAIアプリの話
Avatar for ITO Akihiro akit37
0
440
Androidだけじゃない、DroidKaigiで広がった私の技術スタック
Avatar for Akio Itaya akkeylab
0
120
設計次第でAIコードの読む量は減らせる / designing-for-code-reading
Avatar for MinoDriven minodriven
34
16k

Featured

See All Featured
Money Talks: Using Revenue to Get Sh*t Done
Avatar for Nikki Halliwell nikkihalliwell
0
520
[SF Ruby Conf 2025] Rails X
Avatar for Vladimir Dementyev palkan
3
1.4k
Exploring anti-patterns in Rails
Avatar for Elle Meredith aemeredith
4
530
Why You Should Never Use an ORM
Avatar for John Nunemaker jnunemaker
PRO
61
10k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
Avatar for Eileen M. Uchitelle eileencodes
141
35k
Applied NLP in the Age of Generative AI
Avatar for Ines Montani inesmontani
PRO
4
2.5k
WCS-LA-2024
Avatar for Leonardo Collado-Torres lcolladotor
0
870
Distributed Sagas: A Protocol for Coordinating Microservices
Avatar for Caitie McCaffrey caitiem20
333
23k
A Soul's Torment
Avatar for Nat Ma seathinner
8
3.7k
How to build an LLM SEO readiness audit: a practical framework
Avatar for Nick Samuel nmsamuel
2
940
End of SEO as We Know It (SMX Advanced Version)
Avatar for Michael King ipullrank
3
4.4k
Music & Morning Musume
Avatar for Bryan Veloso bryan
48
7.4k

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!