Rewrite to_rugbits

thesethreewords.py

@@ -165,7 +165,7 @@ class WordHasher(object):
             
         return N
 
-    def to_rugbits(self, integer):
+    def to_rugbits_old(self, integer):
         """Convert a 45bit `integer` to a list of 3rugbits
     
         A rugbit is like a byte but with 15bits instead of eight.
@@ -176,6 +176,17 @@ class WordHasher(object):
                    integer & fifteen_bits]
         return rugbits
 
+    def to_rugbits(self, integer):
+        """Convert a 45bit `integer` to a list of 3rugbits
+
+        A rugbit is like a byte but with 15bits instead of eight.
+        """
+        fifteen_bits = 0b111111111111111
+        rugbits = [(integer >> 30) & fifteen_bits,
+                   (integer >> 15) & fifteen_bits,
+                   integer & fifteen_bits]
+        return rugbits
+
     def rugbits_to_int(self, rugbits):
         """Convert a list of `rugbits` to an integer"""
         assert len(rugbits) == 3