New submission from James Saryerwinnie <[email protected]>:
There was a change in behavior in Python 3.8.10 when using relative paths in
sys.path. It appears that the paths are now converted to absolute paths that
are cached and can cause import errors in some cases.
Repro:
$ cat repro.sh
#!/bin/bash
python --version
mkdir -p /tmp/repro/{A,B}/testproject
echo "msg = 'from A'" > /tmp/repro/A/testproject/app.py
echo "msg = 'from B'" > /tmp/repro/B/testproject/app.py
python -c "
import sys, os, shutil
os.chdir('/tmp/repro/A')
sys.path.append('testproject')
import app
print(app)
print(app.msg)
os.chdir('/tmp/repro/B')
shutil.rmtree('/tmp/repro/A')
del sys.modules['app']
import app
print(app)
print(app.msg)
"
rm -rf /tmp/repro
On Python 3.8.9 I get:
$ ./repro.sh
Python 3.8.9
<module 'app' from 'testproject/app.py'>
from A
<module 'app' from 'testproject/app.py'>
from B
On Python 3.8.10 I get:
$ ./repro.sh
Python 3.8.10
<module 'app' from '/private/tmp/repro/A/testproject/app.py'>
from A
Traceback (most recent call last):
File "<string>", line 12, in <module>
ModuleNotFoundError: No module named 'app'
I haven't confirmed this (I can't work out the frozen bootstrap stuff), but
this might be caused by https://bugs.python.org/issue43105, whose patch does
seem to be converting paths to absolute paths.
----------
components: Library (Lib)
messages: 393212
nosy: James.Saryerwinnie
priority: normal
severity: normal
status: open
title: Regression with relative paths in sys.path in python 3.8.10
type: behavior
versions: Python 3.10, Python 3.11, Python 3.8, Python 3.9
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue44070>
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