1 files changed, 3 insertions, 1 deletions
diff --git a/Lib/random.py b/Lib/random.py
index be4401c..e24737d 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -413,8 +413,10 @@ class Random(_random.Random):
             raise TypeError('Cannot specify both weights and cumulative weights')
         if len(cum_weights) != n:
             raise ValueError('The number of weights does not match the population')
-        bisect = _bisect
         total = cum_weights[-1] + 0.0   # convert to float
+        if total <= 0.0:
+            raise ValueError('Total of weights must be greater than zero')
+        bisect = _bisect
         hi = n - 1
         return [population[bisect(cum_weights, random() * total, 0, hi)]
                 for i in _repeat(None, k)]