The first batch of changes recommended by the fixdiv tool.  These are
mostly changes of / operators into //.  Once or twice I did more or
less than recommended.
diff --git a/Lib/test/test_binascii.py b/Lib/test/test_binascii.py
index f03fc55..cc78ee3 100755
--- a/Lib/test/test_binascii.py
+++ b/Lib/test/test_binascii.py
@@ -54,10 +54,10 @@
         fillers = fillers + c
 def addnoise(line):
     noise = fillers
-    ratio = len(line) / len(noise)
+    ratio = len(line) // len(noise)
     res = ""
     while line and noise:
-        if len(line) / len(noise) > ratio:
+        if len(line) // len(noise) > ratio:
             c, line = line[0], line[1:]
         else:
             c, noise = noise[0], noise[1:]