Make history parameter check more explicit

alpacahq · May 15, 2019 · ce43613 · ce43613
1 parent e9f79c6
commit ce43613
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pylivetrader/data/bardata.py b/pylivetrader/data/bardata.py
@@ -123,7 +123,7 @@ def fetch(asset, field):
 
     def history(self, assets, fields, bar_count, frequency):
 
-        if not assets and fields:
+        if not (assets and fields):
             return None
 
         if isinstance(fields, str):