Latest commit b5b2fb5 Jan 11, 2017 Kyle Lippincott Disable sitecustomize when checking python version
Sitecustomize files can be slow or broken and might hang editor
startup.  Since they aren't necessary for checking the python version,
disable them to get a small speed boost for everyone, and an editor
that doesn't hang indefinitely on startup if the sitecustomize gets
into an infinite loop (due to a bad NFS mount or similar).