code: def _get_docstring(self):
          
          left = self.position
          while left:
              if self.source_code[left: left + 3] in ['"""', "'''"]:
                  left += 3
                  break
              left -= 1
          right = self.position
          while right < len(self.source_code):
              if self.source_code[right - 3: right] in ['"""', "'''"]:
                  right -= 3
                  break
              right += 1
          if left and right < len(self.source_code):
              return self.source_code[left: right]
          return ''
docs: Find the docstring we are currently in.