From 07bbd0c70d464e60568bdc49eb13c8498b52b2bd Mon Sep 17 00:00:00 2001
From: John Myers <9696606+johntmyers@users.noreply.github.com>
Date: Sun, 15 Mar 2026 20:12:20 -0700
Subject: [PATCH] chore: track .python-version to pin Python 3.13.12 for uv

The sandbox base image runs Python 3.13. A stale venv on 3.12 causes
all exec_python E2E tests to fail because cloudpickle bytecode is not
compatible across minor versions.
---
 .gitignore      | 2 +-
 .python-version | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 .python-version

diff --git a/.gitignore b/.gitignore
index 584b4c44e..32610f714 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,7 +56,7 @@ python/*.data
 venv/
 ENV/
 env/
-.python-version
+# .python-version is tracked — pins uv to match the sandbox base image Python
 
 # Installer logs
 pip-log.txt
diff --git a/.python-version b/.python-version
new file mode 100644
index 000000000..44305e2f8
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.13.12