Function _version_mismatch_message

src/black/__init__.py:215–224

(target_versions: set[TargetVersion])

def _version_mismatch_message(target_versions: set[TargetVersion]) -> str:
    max_target = max(target_versions, key=lambda tv: tv.value)
    runtime = f"{sys.version_info[0]}.{sys.version_info[1]}"
    return (
        f"Python {runtime} cannot parse code formatted for"
        f" {max_target.pretty()}. To fix this: run Black with"
        f" {max_target.pretty()}, set --target-version to"
        f" py3{sys.version_info[1]}, or use --fast to skip the safety"
        " check."
    )


def enable_unstable_feature_callback(