MAINT: print function clean up in preparation for Python 3

- Use `print()` function for all print calls
- Fix strip and format calls that were on the outside of the
  print function for some reason.
  (Which were breaking in Python 3 because of print returning None.)
- Remove commented out print calls.

tests/test_perf_tracking.py

@@ -974,7 +974,6 @@ shares in position"
             "should have a cost basis of 11.33"
         )
 
-        # print "second period pnl is {pnl}".format(pnl=pp2.pnl)
         self.assertEqual(pp.pnl, -800, "this period goes from +400 to -400")
 
         pp3 = perf.PerformancePeriod(1000.0)

tests/test_transforms.py

@@ -300,7 +300,7 @@ class TestTALIB(TestCase):
                  and n not in BLACKLIST]
 
         for name in names:
-            print name
+            print(name)
             zipline_transform = getattr(ta, name)(sid=0)
             talib_fn = getattr(talib.abstract, name)
 
@@ -337,7 +337,7 @@ class TestTALIB(TestCase):
                     and np.all(np.isnan(expected_result))):
                 self.assertTrue(np.allclose(zipline_result, expected_result))
             else:
-                print '--- NAN'
+                print('--- NAN')
 
             # reset generator so next iteration has data
             # self.source, self.panel = \

zipline/data/loader.py

@@ -163,7 +163,7 @@ def load_market_data(bm_symbol='^GSPC'):
         print("""
 data files aren't distributed with source.
 Fetching data from Yahoo Finance.
-""").strip()
+""".strip())
         dump_benchmarks(bm_symbol)
         fp_bm = get_datafile(get_benchmark_filename(bm_symbol), "rb")
 
@@ -211,7 +211,7 @@ Fetching data from Yahoo Finance.
         print("""
 data files aren't distributed with source.
 Fetching data from {0}
-""").format(source).strip()
+""".format(source).strip())
         dump_treasury_curves(module, filename)
         fp_tr = get_datafile(filename, "rb")
 
@@ -277,7 +277,7 @@ must specify stocks or indexes"""
 
     if stocks is not None:
         for stock in stocks:
-            print stock
+            print(stock)
             cache_filename = "{stock}-{start}-{end}.csv".format(
                 stock=stock,
                 start=start,
@@ -292,7 +292,7 @@ must specify stocks or indexes"""
 
     if indexes is not None:
         for name, ticker in indexes.iteritems():
-            print name
+            print(name)
             stkd = DataReader(ticker, 'yahoo', start, end).sort_index()
             data[name] = stkd
 

zipline/examples/dual_moving_average.py

@@ -96,5 +96,5 @@ if __name__ == '__main__':
     plt.legend(loc=0)
 
     sharpe = [risk['sharpe'] for risk in dma.risk_report['one_month']]
-    print "Monthly Sharpe ratios:", sharpe
+    print("Monthly Sharpe ratios: {0}".format(sharpe))
     plt.gcf().set_size_inches(18, 8)

zipline/examples/olmar.py

@@ -128,9 +128,9 @@ def simplex_projection(v, b=1):
 
     :Example:
     >>> proj = simplex_projection([.4 ,.3, -.4, .5])
-    >>> print proj
+    >>> print(proj)
     array([ 0.33333333, 0.23333333, 0. , 0.43333333])
-    >>> print proj.sum()
+    >>> print(proj.sum())
     1.0
 
     Original matlab implementation: John Duchi (jduchi@cs.berkeley.edu)

zipline/test_algorithms.py

@@ -340,7 +340,7 @@ class TestTargetValueAlgorithm(TradingAlgorithm):
             self.target_shares = 10
             return
         else:
-            print self.portfolio
+            print(self.portfolio)
             assert self.portfolio.positions[0]['amount'] == \
                 self.target_shares, "Orders not filled immediately."
             assert self.portfolio.positions[0]['last_sale_price'] == \