Skip to content

gh-127727: Warn when running a virtual environment created for a different minor Python version #149715

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
sepehr-rs wants to merge 4 commits into
base: main
Choose a base branch
from
+25 −0
Open

gh-127727: Warn when running a virtual environment created for a different minor Python version #149715

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
14a1e7a
Compare pyenv.cfg version field with sys.version_info and emit a Run…
sepehr-rs May 12, 2026
1bca0c8
Add news entry
sepehr-rs May 12, 2026
5d0238f
Fix linting issues
sepehr-rs May 12, 2026
64a8f28
Fix linting
sepehr-rs May 12, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
22 changes: 22 additions & 0 deletions Lib/site.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -796,6 +796,7 @@ def venv(known_paths):
if candidate_conf:
virtual_conf = candidate_conf
system_site = "true"
version = None
# Issue 25185: Use UTF-8, as that's what the venv module uses when
# writing the file.
with open(virtual_conf, encoding='utf-8') as f:
Expand All @@ -808,6 +809,27 @@ def venv(known_paths):
system_site = value.lower()
elif key == 'home':
sys._home = value
elif key == 'version':
version = value

if version:
try:
major, minor = map(int, version.split(".")[:2])
except ValueError:
major, minor = None
if (
major == sys.version_info.major
and minor is not None
and minor != sys.version_info.minor
and not hasattr(sys, "_venv_version_warning_emitted")
):
_warn(
f"This virtual environment was created for Python {major}.{minor}, "
f"but the current interpreter is Python "
f"{sys.version_info.major}.{sys.version_info.minor}. "
"Consider running `python -m venv --upgrade` to update the environment.",
RuntimeWarning,
)

if sys.prefix != site_prefix:
_warn(f'Unexpected value in sys.prefix, expected {site_prefix}, got {sys.prefix}', RuntimeWarning)
Expand Down
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-05-12-12-49-30.gh-issue-127727.hNmj9G.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Warn when running a virtual environment created for a different minor Python
version than the current interpreter, and suggest using ``python -m venv
--upgrade``.
Loading