diff --git a/source/_static/code/gc_percent.py b/source/_static/code/gc_percent.py
index 0f6575d5e0e206954b582f486b0923b01b8a9298..a9abe85aad840581c25a3f1df7acdc7f99e1789c 100644
--- a/source/_static/code/gc_percent.py
+++ b/source/_static/code/gc_percent.py
@@ -1,11 +1,13 @@
 
 def gc_percent(seq):
     """
+    Compute the ratio of GC in a DNA sequence
+
     :param seq: The nucleic sequence to compute
     :type seq: string
     :return: the percent of GC in the sequence
     :rtype: float
     """
     seq = seq.upper()
-    gc_pc = float(seq.count('G') + seq.count('C')) / float(len(seq))
+    gc_pc = seq.count('G') + seq.count('C') / len(seq)
     return gc_pc