From 5279fb99cb309b422c2ba11eadc01368b6d997f1 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sat, 25 Jun 2011 11:30:53 +0200
Subject: Code simplification suggested by Sven Marnach.

---
 Lib/random.py | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/Lib/random.py b/Lib/random.py
index 59a4052..ccc304d 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -402,11 +402,9 @@ class Random(_random.Random):
         # lambd: rate lambd = 1/mean
         # ('lambda' is a Python reserved word)
 
-        random = self.random
-        u = random()
-        while u <= 1e-7:
-            u = random()
-        return -_log(u)/lambd
+        # we use 1-random() instead of random() to preclude the
+        # possibility of taking the log of zero.
+        return -_log(1.0 - self.random())/lambd
 
 ## -------------------- von Mises distribution --------------------
 
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