docs: def _get_response(self, parse_result=True):
          """If 'parse_result' is False, ignore the received output and return None."""
          # expect_exact is faster than just exact, and fine for our purpose
          # (http://pexpect.readthedocs.org/en/latest/api/pexpect.html#pexpect.spawn.expect_exact)
          # searchwindowsize and other attributes may also affect efficiency
          self.vw_process.expect_exact('\r\n', searchwindowsize=-1)  # Wait until process outputs a complete line
          if parse_result:
              output = self.vw_process.before
              result_struct = VWResult(output, active_mode=self.active_mode)
          else:
              result_struct = None
          return result_struct