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Jeremiah Lowin
dd37a49f2f
Currently, `order_percent()` and `order_target_percent()` both operate as a percentage of `self.portfolio.portfolio_value`. This PR lets them operate as percentages of other important MVs.
(also adds `context.get_market_value()`, which enables this functionality)
For example:
```python
order_percent('AAPL', 0.5)
order_percent('AAPL', 0.5, percent_of='cash')
order_target_percent('MSFT', 0.1, percent_of='shorts')
tech_stocks = ('AAPL', 'MSFT', 'GOOGL')
tech_filter = lambda p: p.sid in tech_stocks
for stock in tech_stocks:
order_target_percent(stock, 1/3, percent_of_fn=tech_filter)
```