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Unsafe subtype: datetime/date - #20448

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m-aciek wants to merge 18 commits into

python:masterfrom

m-aciek:unsafe-subtype

Commits on Dec 19, 2025
- Initial plan
  Copilot
  committed
  5a9efed
- Implement unsafe subtype checking for datetime/date comparisons
  
  Copilot
  and
  m-aciek
  committed
  126ffab
- Fix docstring indentation and line continuation style
  
  Copilot
  and
  m-aciek
  committed
  7ff17b2
- Flag date vs date comparisons as unsafe when datetime subclass exists
  
  Copilot
  and
  m-aciek
  committed
  857f0fa
- Add detailed documentation for supertype comparison checking
  
  Copilot
  and
  m-aciek
  committed
  ffc3592
- Block datetime/date inheritance when unsafe-subtype is enabled
  
  Copilot
  and
  m-aciek
  committed
  901cdec
- Move errorcodes import to module level for performance
  
  Copilot
  and
  m-aciek
  committed
  cb83a2a
Commits on Dec 20, 2025
- Remove date/date comparison warnings as inheritance blocking makes them redundant
  
  Copilot
  and
  m-aciek
  committed
  1b55f52
- Remove redundant comparison check code in visit_comparison_expr
  
  Copilot
  and
  m-aciek
  committed
  2d231f5
- Add documentation for unsafe-subtype error code
  
  Copilot
  and
  m-aciek
  committed
  5ee1d68
- [pre-commit.ci] auto fixes from pre-commit.com hooks
  pre-commit-ci[bot]
  committed
  427f31c
Commits on Dec 26, 2025
- Remove superfluous iteration
  
  m-aciek
  and
  sterliakov
  authored
  089e952
Commits on Jan 21, 2026
- Refactor to focus on datetime/date only with safe-datetime error code
  
  Copilot
  and
  m-aciek
  committed
  4f9f289
- [pre-commit.ci] auto fixes from pre-commit.com hooks
  pre-commit-ci[bot]
  committed
  bdd8978
- Simplify code in subtypes.py
  m-aciek
  committed
  b2cc802
Commits on Feb 4, 2026
- Rename the error code to unsafe-datetime
  
  m-aciek
  and
  wyattscarpenter
  committed
  f9db8fe
- Fix title underline length in docs
  m-aciek
  committed
  1bd42a6
Commits on Jul 19, 2026
- Remove duplications from test file
  m-aciek
  committed
  ae383b5

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Unsafe subtype: datetime/date - #20448

Unsafe subtype: datetime/date#20448
m-aciek wants to merge 18 commits into
python:masterfrom
m-aciek:unsafe-subtype

Commits on Dec 19, 2025

Initial plan

Implement unsafe subtype checking for datetime/date comparisons

Fix docstring indentation and line continuation style

Flag date vs date comparisons as unsafe when datetime subclass exists

Add detailed documentation for supertype comparison checking

Block datetime/date inheritance when unsafe-subtype is enabled

Move errorcodes import to module level for performance

Commits on Dec 20, 2025

Remove date/date comparison warnings as inheritance blocking makes them redundant

Remove redundant comparison check code in visit_comparison_expr

Add documentation for unsafe-subtype error code

[pre-commit.ci] auto fixes from pre-commit.com hooks

Commits on Dec 26, 2025

Remove superfluous iteration

Commits on Jan 21, 2026

Refactor to focus on datetime/date only with safe-datetime error code

[pre-commit.ci] auto fixes from pre-commit.com hooks

Simplify code in subtypes.py

Commits on Feb 4, 2026

Rename the error code to unsafe-datetime

Fix title underline length in docs

Commits on Jul 19, 2026

Remove duplications from test file