code: def _value_with_fmt(self, val):
          
          fmt = None
  
          if is_integer(val):
              val = int(val)
          elif is_float(val):
              val = float(val)
          elif is_bool(val):
              val = bool(val)
          elif isinstance(val, datetime):
              fmt = self.datetime_format
          elif isinstance(val, date):
              fmt = self.date_format
          elif isinstance(val, timedelta):
              val = val.total_seconds() / float(86400)
              fmt = '0'
          else:
              val = compat.to_str(val)
  
          return val, fmt
docs: Convert numpy types to Python types for the Excel writers.
  
          Parameters
          ----------
          val : object
              Value to be written into cells
  
          Returns
          -------
          Tuple with the first element being the converted value and the second
              being an optional format