ullable
  public static String pyVersion(@Nullable String versionString) {
    final String prefix = "Python ";
    if (versionString != null && versionString.startsWith(prefix)) {
      final String version = versionString.substring(prefix.length());
      int dot = version.indexOf('.');
      if (dot > 0) {
        dot = version.indexOf('.', dot + 1);
        if (dot > 0) {
          return version.substring(0, dot);
        }
        return version;
      }
    }
    return null;
  }
}
ullable
  public static String pyVersion(@Nullable String versionString) {