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lazy imports allow lazy import math.pi #155194

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lazy imports allow lazy import math.pi#155194
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DinoV
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3.15bugs and security fixes3.16new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)release-blockertopic-lazy-importstype-bugAn unexpected behavior, bug, or error

Description

@DinoV
DinoV
opened on Aug 4, 2026

Bug report

Bug description:

lazy import math.pi
print(math.pi)

as reported: https://discuss.python.org/t/sys-lazy-modules-clarification/108385

This is a big difference in that we allow these in lazy imports but not normal imports. It's also due to just a bunch of extra unnecessary logic. Fixing this now seems like it'd be better than letting people start doing this.

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

Activity

  1. DinoV
    added
    type-bugAn unexpected behavior, bug, or error
    on Aug 4, 2026
  2. DinoV
    self-assigned this
    on Aug 4, 2026
  3. StanFromIreland
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    topic-lazy-imports
    3.15bugs and security fixes
    3.16new features, bugs and security fixes
    on Aug 5, 2026

  4. encukou commented on Aug 11, 2026

    @encukou
    encukou
    on Aug 11, 2026
    Member

    Hugo said:

    Yes, let's fix this for rc2, and do it in main first.

    I'll mark this as a release blocker for visibility.

  5. encukou
    added
    release-blocker
    on Aug 11, 2026
  6. github-project-automation
    added this to Release and Deferred blockers 🚫on Aug 11, 2026
  7. github-project-automation
    moved this to Todo in Release and Deferred blockers 🚫on Aug 11, 2026
  8. DinoV
    added a commit that references this issue on Aug 14, 2026

    gh-155194: Fix not raising on non-module import (#155189)

    dffac61
  9. pablogsal
    added a commit that references this issue on Aug 19, 2026

    [3.15] gh-155194: Fix not raising on non-module import (GH-155189) (#…

    e531dd4

  10. encukou commented on Aug 21, 2026

    @encukou
    encukou
    on Aug 21, 2026
    Member

    Thank you for the fix!

  11. encukou
    closed this as completedon Aug 21, 2026
  12. github-project-automation
    moved this from Todo to Done in Release and Deferred blockers 🚫on Aug 21, 2026
  13. brittanyrey
    added 2 commits that reference this issue on Sep 18, 2026

    Import a lazy submodule that a package attribute shadows

    00da645

    Import a lazy submodule that a package attribute shadows

    2b0aa85
  14. StanFromIreland
    marked test_concurrent_lazy_import_reification is flaky #154561 as a duplicate of this issue on Sep 18, 2026
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3.15bugs and security fixes3.16new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)release-blockertopic-lazy-importstype-bugAn unexpected behavior, bug, or error

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