old_contents: from doctest import REPORT_NDIFF, ELLIPSIS
  
  from sybil import Sybil
  from sybil.parsers.doctest import DocTestParser, FIX_BYTE_UNICODE_REPR
  from sybil.parsers.codeblock import CodeBlockParser
  from sybil.parsers.capture import parse_captures
  
  from testfixtures.sybil import FileParser
  
  
  pytest_collect_file = Sybil(
      parsers=[
          DocTestParser(optionflags=REPORT_NDIFF|ELLIPSIS|FIX_BYTE_UNICODE_REPR),
          CodeBlockParser(['print_function']),
          parse_captures,
          FileParser('tempdir'),
      ],
      pattern='*.txt',
  ).pytest()
  
new_contents: from doctest import REPORT_NDIFF, ELLIPSIS
  
  from sybil import Sybil
  from sybil.parsers.doctest import DocTestParser, FIX_BYTE_UNICODE_REPR
  from sybil.parsers.codeblock import CodeBlockParser
  from sybil.parsers.capture import parse_captures
  
  from testfixtures.compat import PY3
  from testfixtures.sybil import FileParser
  
  
  if PY3:
      pytest_collect_file = Sybil(
          parsers=[
              DocTestParser(optionflags=REPORT_NDIFF|ELLIPSIS|FIX_BYTE_UNICODE_REPR),
              CodeBlockParser(['print_function']),
              parse_captures,
              FileParser('tempdir'),
          ],
          pattern='*.txt',
      ).pytest()
  
subject: stop testing docs on PY2.