Repository navigation
pth files in site-packages of venvs are executed twice #75723
Description
| 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.
Show more details
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']
Activity
anntzer commentedon Sep 21, 2017
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.
sinoroc commentedon Feb 20, 2020
https://stackoverflow.com/a/60169657/11138259
Merge branch 'main' into asottile-pythongh-75723
Merge remote-tracking branch 'origin/main' into asottile-pythongh-75723
warsaw commentedon May 8, 2026
@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!
gh-75723: Fix double evaluation of .pth and .site files in venvs (#14…
pythongh-149819: Fix .pth files not loaded in Python subprocesses
gh-149819: fix .pth and .start file processing in subprocess when inh…
[3.15] gh-149819: fix .pth and .start file processing in subprocess w…
tcely commentedon May 22, 2026
@warsaw After your latest commits; what's left outstanding for this issue?
warsaw commentedon May 22, 2026
Thanks for the ping @tcely - I think we can close this now.