diff --git a/utils.py b/utils.py
index 554ab0958..9d9b93cd1 100644
--- a/utils.py
+++ b/utils.py
@@ -193,7 +193,9 @@ def probability(p):
     """Return true with probability p."""
     return p > random.uniform(0.0, 1.0)
 
+
 def weighted_sample_with_replacement(n, seq, weights):
+
     """Pick n samples from seq at random, with replacement, with the
     probability of each element in proportion to its corresponding
     weight."""