test_re.py 文件源码

def test_debug_flag(self):
        pat = r'(\.)(?:[ch]|py)(?(1)$|: )'
        with captured_stdout() as out:
            re.compile(pat, re.DEBUG)
        dump = '''\
subpattern 1
  literal 46
subpattern None
  branch
    in
      literal 99
      literal 104
  or
    literal 112
    literal 121
subpattern None
  groupref_exists 1
    at at_end
  else
    literal 58
    literal 32
'''
        self.assertEqual(out.getvalue(), dump)
        # Debug output is output again even a second time (bypassing
        # the cache -- issue #20426).
        with captured_stdout() as out:
            re.compile(pat, re.DEBUG)
        self.assertEqual(out.getvalue(), dump)