code: def order_percent(self,
                        asset,
                        percent,
                        limit_price=None,
                        stop_price=None,
                        style=None):
          
          if not self._can_order_asset(asset):
              return None
  
          amount = self._calculate_order_percent_amount(asset, percent)
          return self.order(asset, amount,
                            limit_price=limit_price,
                            stop_price=stop_price,
                            style=style)
docs: Place an order in the specified asset corresponding to the given
          percent of the current portfolio value.
  
          Parameters
          ----------
          asset : Asset
              The asset that this order is for.
          percent : float
              The percentage of the portfolio value to allocate to ``asset``.
              This is specified as a decimal, for example: 0.50 means 50%.
          limit_price : float, optional
              The limit price for the order.
          stop_price : float, optional
              The stop price for the order.
          style : ExecutionStyle
              The execution style for the order.
  
          Returns
          -------
          order_id : str
              The unique identifier for this order.
  
          Notes
          -----
          See :func:`zipline.api.order` for more information about
          ``limit_price``, ``stop_price``, and ``style``
  
          See Also
          --------
          :class:`zipline.finance.execution.ExecutionStyle`
          :func:`zipline.api.order`
          :func:`zipline.api.order_value`