Changed syntax in testutils.py that is introduced in 3.6 to a backwards compatible version.

AdamGS · AdamGS · commit 81a9e6984db0 · 2019-02-21T14:47:36.000-05:00
diff --git a/tests/snippets/testutils.py b/tests/snippets/testutils.py
@@ -14,7 +14,7 @@ def assert_raises(exc_type, expr, msg=None):
     except exc_type:
         pass
     else:
-        failmsg = f'{exc_type.__name__} was not raised'
+        failmsg = '%s was not raised' % exc_type.__name__
         if msg is not None:
-            failmsg += f': {msg}'
+            failmsg += ': %s' % msg
         assert False, failmsg
