Writing Python Like Rust

Re:Writing Python Like Rust by synergy20 on Wednesday June 28, 2023 @11:21PM (#36515940)

django has 500K lines of python and it's considered well written and stable, so it's possible to do python with large code base I think. oddly, django does not seem to be even using type hints, new features such as dataclasses was not found from the source base either, still it just works well somehow.

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Re:Writing Python Like Rust by dsissitka on Wednesday June 28, 2023 @11:57PM (#36516146)

I was curious:

  SLOC    Directory       SLOC-by-Language (Sorted)
  232099  tests           python=232099
  102470  django          python=102470
  424     docs            python=424
  158     scripts         python=142,sh=16
  21      top_dir         python=21
  0       extras          (none)
  0       js_tests        (none)
  
  Totals grouped by language (dominant language first):
  python:      335156 (100.00%)
  sh:              16 (0.00%)
  
  Please credit this data as "generated using David A. Wheeler's 'SLOCCount'."

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Re:Writing Python Like Rust by deepsun on Thursday June 29, 2023 @03:01AM (#36517297)

Wow, 2.3x for tests/src ratio. I remember some recommendation for Java to have around 0.9x ratio, otherwise too much tests maintenance.

Depends on the project of course, e.g. SQLite has an insane ratio.

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Re:Writing Python Like Rust by cies on Thursday June 29, 2023 @07:51AM (#36519192)

Could also be that Java's typing already accounts for some part of what would need to be tests in Python code...

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Re:Writing Python Like Rust by deepsun on Thursday June 29, 2023 @03:34PM (#36525596)

Exactly, that's what I meant. E.g.

    if very_rare_condition:
       raise MyRareException

Java wouldn't compile (no exception instantiation), but Python would work fine in production until the rare condition happened (but not captured above, as it's a class, not instance). Cases like that justify 100% tests coverage in Python, but not Java.

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Re:Writing Python Like Rust by simonw on Thursday June 29, 2023 @12:00AM (#36516163)

That's because a great deal of Django was written before type hints or even dataclasses existed.

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Re:Writing Python Like Rust by Hamuko on Thursday June 29, 2023 @04:23AM (#36517817)

And type hints aren't really that mature yet. If you look at the `typing` module's documentation in Python 3.11, there's 23 occurrences of the string "Changed in version". And the Python 3.12 version of the same document adds 9 more. Type hinting in Python is constantly evolving.

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Re:Writing Python Like Rust by walthamstow on Thursday June 29, 2023 @10:25AM (#36520772)

That's the main reason we haven't adopted it at my place. We do have types of args and returns in docstrings though and it is enough for IDEs to do checks and suggestions from those types.

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