Two improvements suggested by Tim Peters: speed up random() since we
know Python integers are at least 32 bits long; and avoid zeros in
initial seed value.
diff --git a/Lib/whrandom.py b/Lib/whrandom.py
index 8250234..bd2dcf7 100644
--- a/Lib/whrandom.py
+++ b/Lib/whrandom.py
@@ -54,20 +54,17 @@
t, x = divmod(t, 256)
t, y = divmod(t, 256)
t, z = divmod(t, 256)
- self._seed = (x, y, z)
+ # Zero is a poor seed, so substitute 1
+ self._seed = (x or 1, y or 1, z or 1)
#
# Get the next random number in the range [0.0, 1.0).
#
def random(self):
x, y, z = self._seed
#
- x1, x2 = divmod(x, 177)
- y1, y2 = divmod(y, 176)
- z1, z2 = divmod(z, 178)
- #
- x = (171 * x2 - 2 * x1) % 30269
- y = (172 * y2 - 35 * y1) % 30307
- z = (170 * z2 - 63 * z1) % 30323
+ x = (171 * x) % 30269
+ y = (172 * y) % 30307
+ z = (170 * z) % 30323
#
self._seed = x, y, z
#