add portolio capability

README.md

@@ -1,17 +1,11 @@
 pinkfish
 ======
 
+**06-13-2020: Add Portfolio cabability, i.e. multiple stocks at the same time (see portfolio example)**
+**06-13-2020: Support ended for Python2.7.  Now Pinkfish is Python3 only**
 **02-16-2020: Download latest time series for every S&P 500 component (see sp500-components-timeseries example)**   
 **02-16-2020: Update your entire ticker symbol cache to latest time series (see update-cache-symbols example)**   
 **01-31-2020: Add basic multi symbol support (see trade-two-symbols example)**  
-**12-27-2019: Integration with Quantopian's pyfolio and empyrical libraries (see pyfolio-empyrical example)**  
-**12-24-2019: Use trade_log to create trade_state column in daily_balance.  No longer need to manually set trade_state**  
-**12-20-2019: Add capability to merge like trades (all buys or all sells) that occur on same day (see merge-trades example)**  
-**12-13-2019: Add calendar columns to a dataframe (see sell-in-may-and-go-away example)**  
-**11-12-2019: Add prettier_graphs (see double-7s example)**  
-**11-01-2019: Add monthly and holding_period tables (see buy-and-hold example)**  
-**10-18-2019: Add capability to maintain a certain value, shares, or percent in a security (see percent-allocate example)**  
-**07-31-2019: First major update since original release - Add scale-in and scale-out capability**
 
 A backtester and spreadsheet library for security analysis.
 

examples/README.md

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 # Example trading strategies
 
-- `buy-and-hold`: simple buy and hold strategy; demonstrate monthly and holding period tables
+- `buy-and-hold`: simple buy and hold strategy
 - `double-7s`: buy on X day low, sell on X day high (use closing prices)
 - `double-7s-intra`: buy on X day low, sell on X day high (use intraday prices)
 - `double-7s-open`: same as double-7s, but sell next open instead of current close
@@ -10,12 +10,16 @@
 - `momentum`: A stock that's going up tends to keep going up...until it doesn't
 - `percent-allocate`: maintain a certain percentage allocation to a security
 - `pinkfish-challenge`: buy on the close on the SAME day a new 20 day high is set
+- `portfolio`: backtest a portfolio of stocks
 - `pyfolio-empyrical`: demonstrates integration with quantopian's pyfolio and empyrical libraries
 - `scaling-in`: scale in strategy
 - `scaling-in-out`: scale in and out strategy
 - `scaling-out`: scale out strategy
 - `sell-in-may-and-go-away`: demonstration of using the calendar module
 - `sma-percent-band`: trading strategy using price vs long term sma; percent band around sma used for hysteresis
+- `sp500-components-timeseries`: get timeseries of all components in sp500
 - `spreadsheet`: make a read only spreadsheet within jupyter notebook
 - `ta-lib-tutorial`: a tutorial on using the ta-lib technical analysis library
 - `trade-two-symbols`: same as golden-cross example, except hold GLD when not in SPY; demonstrates trading 2 symbols
+- `trading-evolved`: demonstrate monthly returns, holding period returns, and prettier graphs
+- `update-cache-symbols`: utility to update all the symbols in your data cache