BLD: created a new sample algo for instructional materials. Fixed some minor issues in the process.

catalyst/examples/simple_loop.py

@@ -7,7 +7,7 @@ from catalyst.api import symbol
 
 def initialize(context):
     print('initializing')
-    context.asset = symbol('eth_btc')
+    context.asset = symbol('swift_btc')
 
 
 def handle_data(context, data):
@@ -20,8 +20,8 @@ def handle_data(context, data):
         prices = data.history(
             context.asset,
             fields='price',
-            bar_count=16,
-            frequency='60T'
+            bar_count=15,
+            frequency='1D'
         )
         rsi = talib.RSI(prices.values, timeperiod=14)[-1]
         print('got rsi: {}'.format(rsi))
@@ -31,13 +31,13 @@ def handle_data(context, data):
 
 run_algorithm(
     capital_base=250,
-    start=pd.to_datetime('2016-6-1', utc=True),
+    start=pd.to_datetime('2015-4-1', utc=True),
     end=pd.to_datetime('2017-11-1', utc=True),
     data_frequency='daily',
     initialize=initialize,
     handle_data=handle_data,
     analyze=None,
-    exchange_name='bitfinex',
+    exchange_name='bittrex',
     algo_namespace='simple_loop',
     base_currency='btc'
 )