But that's not an error message; it's just a copy of the offending line in the file!

  $ python2
  Python 2.7.17 (default, Feb 27 2021, 15:10:58) 
  [GCC 7.5.0] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> 0_0  # Python >= 3.6 is required
    File "<stdin>", line 1
      0_0  # Python >= 3.6 is required