Syntax Error when Fetching Sources for UEFI Build

[naortega]

When trying to fetch the sources with the first init command I get a syntax error with a Python script within the container:

$ sudo docker run -v "$PWD:/work" 8040efibldr -u $(id -u) -g $(id -g) -- init
/work/build /work
gpg: keybox '/home/build/.repoconfig/gnupg/pubring.kbx' created
gpg: /home/build/.repoconfig/gnupg/trustdb.gpg: trustdb created
gpg: key 16530D5E920F5C65: public key "Repo Maintainer <[email protected]>" imported
gpg: key 67B7E448692B382C: public key "Conley Owens <[email protected]>" imported
gpg: Total number processed: 2
gpg:               imported: 2
Get https://gerrit.googlesource.com/git-repo/clone.bundle
Get https://gerrit.googlesource.com/git-repo
  File "/work/build/.repo/repo/main.py", line 79
    file=sys.stderr)
        ^
SyntaxError: invalid syntax
/work

This is from the gerrit/git-repo repository, from the link above, but this doesn't seem to be an actual syntax error in the script, at least if you pull the repository as-is, as pytest doesn't find this as an error, and the syntax of that command in the code seems to be well-formatted:

  print('repo: error: Python 2 is no longer supported; '
        'Please upgrade to Python {}.{}+.'.format(*MIN_PYTHON_VERSION_SOFT),
        file=sys.stderr)

So I suspect this is an issue with the docker, and not with the code of this other repository.