code: def p_docstring_string(self, p):
          'docstring : STRING'
          # Remove trailing whitespace on every line.
          p[0] = '\n'.join([line.rstrip() for line in p[1].split('\n')]f p_docstring_string(self, p):
          'docstring : STRING'
          # Remove trailing whitespace on every line.
          p[0] = '\n'.join([line.rstrip() for line in p[1].split('\n')])
docs: docstring : STRING