code: def z__update(self):
          
          updates = []
  
          for text in self._updates:
  
              if self._AVOID_RAW_FORM:
                  text_repr = multiline_repr(text)
                  raw_char = ''
              else:
                  text_repr = multiline_repr(text, RAW_MULTILINE_CHARS)
  
                  if len(text_repr) == len(text):
                      raw_char = 'r' if '\\' in text_repr else ''
                  else:
                      # must have special characters that required added backslash
                      # escaping, use normal representation to get backslashes right
                      text_repr = multiline_repr(text)
                      raw_char = ''
  
              # use triple double quote, except use triple single quote when
              # triple double quote is present to avoid syntax errors
              quotes = '"""'
              if quotes in text:
                  quotes = "'''"
  
              # Wrap with blank lines when multi-line or when text ends with
              # characters that would otherwise result in a syntax error in
              # the formatted representation.
              multiline = self._indent or ('\n' in text)
              if multiline or text.endswith('\\') or text.endswith(quotes[0]):
                  update = raw_char + quotes + '\n' + text_repr + '\n' + quotes
              else:
                  update = raw_char + quotes + text_repr + quotes
  
              updates.append(update)
  
          # sort updates so Python hash seed has no impact on regression test
          update = '\n'.join(sorted(updates))
  
          indent = ' ' * self._indent
  
          lines = ((indent + line) if line else '' for line in update.split('\n'))
  
          return '\n'.join(lines).lstrip()
docs: Triple quoted baseline representation.
  
          Return string with multiple triple quoted baseline strings when
          baseline had been compared multiple times against varying strings.
  
          :returns: source file baseline replacement text
          :rtype: str