1 files changed, 3 insertions, 1 deletions
diff --git a/tests/backtest.py b/tests/backtest.py
index 89a25536..7b47ff19 100644
--- a/tests/backtest.py
+++ b/tests/backtest.py
@@ -46,4 +46,6 @@ try:
 except NameError:
     def execfile(filename, globs):
         """A Python 3 implementation of execfile."""
-        exec(compile(open(filename).read(), filename, 'exec'), globs)
+        with open(filename) as fobj:
+            code = fobj.read()
+        exec(compile(code, filename, 'exec'), globs)