tabulate: fix sval -> return typo in _statistic().

diff --git a/pygrader/tabulate.py b/pygrader/tabulate.py
index 1236b842bfbeacc2cf30d84fff14b8948ebb7454..e070c7d018e9d37089eb098712f9da3a09074dfe 100644 (file)
--- a/pygrader/tabulate.py
+++ b/pygrader/tabulate.py
@@ -69,7 +69,7 @@ def _statistic(iterable, statistic):
             return gs.mean()
     elif statistic == 'Std. Dev.':
         if _numpy is None:  # work around missing numpy
-            sval = _std(iterable)
+            return _std(iterable)
         else:
             return gs.std()
     else: