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pth files in site-packages of venvs are executed twice · Issue #75723 · python/cpython · GitHub

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pth files in site-packages of venvs are executed twice #75723

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pth files in site-packages of venvs are executed twice#75723
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3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

anntzer
mannequin
opened on Sep 21, 2017
BPO 31542
Nosy @anntzer, @wimglenn, @sinoroc

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-09-21.09:41:38.759>
labels = ['library']
title = 'pth files in site-packages of venvs are executed twice'
updated_at = <Date 2020-02-20.11:02:15.996>
user = 'https://github.com/anntzer'

bugs.python.org fields:

activity = <Date 2020-02-20.11:02:15.996>
actor = 'sinoroc'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-09-21.09:41:38.759>
creator = 'Antony.Lee'
dependencies = []
files = []
hgrepos = []
issue_num = 31542
keywords = []
message_count = 2.0
messages = ['302678', '362308']
nosy_count = 3.0
nosy_names = ['Antony.Lee', 'wim.glenn', 'sinoroc']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue31542'
versions = ['Python 3.6']

Linked PRs

Activity

  1. anntzer commented on Sep 21, 2017

    anntzermannequin
    on Sep 21, 2017
    MannequinAuthor

    All's in the title: "pth files in site-packages of venvs are executed twice". For example, the following code sample prints "1" twice.

    python -mvenv /tmp/tmpenv
    echo 'import os; print(1)' >/tmp/tmpenv/lib/python3.6/site-packages/foo.pth
    source activate /tmp/tmpenv
    python

    This behavior is different from the one for a pth file in a non-venv site-packages (either the syswide prefix, or the user prefix), which is only executed once.

  2. anntzer
    added
    stdlibStandard Library Python modules in the Lib/ directory
    on Sep 21, 2017

  3. sinoroc commented on Feb 20, 2020

    sinorocmannequin
    on Feb 20, 2020
    Mannequin

    https://stackoverflow.com/a/60169657/11138259

  4. ezio-melotti
    transferred this issue fromon Apr 10, 2022
  5. FFY00
    added a commit that references this issue on Apr 2, 2026

    Merge branch 'main' into asottile-pythongh-75723

    96ed0e8
  6. picnixz
    added
    type-bugAn unexpected behavior, bug, or error
    on Apr 2, 2026
  7. johnslavik
    added
    3.13only security fixes
    3.14bugs and security fixes
    3.15pre-release feature fixes, bugs and security fixes
    on Apr 5, 2026
  8. asottile
    added a commit that references this issue on May 3, 2026

    Merge remote-tracking branch 'origin/main' into asottile-pythongh-75723

    4005472

  9. warsaw commented on May 8, 2026

    warsaw
    on May 8, 2026
    Member

    @asottile It's funny, weird, and scary that my YT algorithm presented me with your video on this right about the time you tagged us on this ticket!

  10. warsaw
    self-assigned this
    on May 8, 2026
  11. warsaw
    added a commit that references this issue on May 11, 2026

    gh-75723: Fix double evaluation of .pth and .site files in venvs (#14…

    1978785
  12. IntentBug
    added a commit that references this issue on May 15, 2026

    pythongh-149819: Fix .pth files not loaded in Python subprocesses

    b7f6ba1
  13. warsaw
    added 2 commits that reference this issue on May 21, 2026

    gh-149819: fix .pth and .start file processing in subprocess when inh…

    3c298e2

    [3.15] gh-149819: fix .pth and .start file processing in subprocess w…

    233cf75

  14. tcely commented on May 22, 2026

    tcely
    on May 22, 2026

    @warsaw After your latest commits; what's left outstanding for this issue?

  15. warsaw commented on May 22, 2026

    warsaw
    on May 22, 2026
    Member

    Thanks for the ping @tcely - I think we can close this now.

  16. warsaw
    closed this as completedon May 22, 2026
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3.13only security fixes3.14bugs and security fixes3.15pre-release feature fixes, bugs and security fixesstdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

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