python / python/mypy

Turn on strict equality checking by default

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#10,168 0 comments 1 reaction 0 assignees View on GitHub

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feature
Dominant language
Python
Stars
20.6k
Forks
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PR merge metrics
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Description

We've supported --strict-equality for quite some time and it works quite well. Maybe it's time to turn it on by default. It would still be possible to use --no-strict-equality to turn it off.

Strict equality checking generates errors for code like 'x' == 5 or 'x' is 5.

We may want to fix some remaining issues first, such as #8296.

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing the existing --strict-equality and --no-strict-equality behavior, then read issue #8296 to identify remaining blockers. Done means strict equality checking is enabled by default, the opt-out remains functional, and the reported compatibility issues are addressed or explicitly resolved.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
devtools
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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