code: def diff_text1(self, diffs):
      
      text = []
      for (op, data) in diffs:
        if op != self.DIFF_INSERT:
          text.append(data)
      return "".join(text)
docs: Compute and return the source text (all equalities and deletions).
  
      Args:
        diffs: Array of diff tuples.
  
      Returns:
        Source text.