From: Raymond Hettinger <python@rcn.com>
Date: Sat, 25 Jun 2011 09:30:53 +0000 (+0200)
Subject: Code simplification suggested by Sven Marnach.
X-Git-Tag: v3.2.1rc2~59
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5279fb99cb309b422c2ba11eadc01368b6d997f1;p=thirdparty%2FPython%2Fcpython.git

Code simplification suggested by Sven Marnach.
---

diff --git a/Lib/random.py b/Lib/random.py
index 59a40526f8a5..ccc304dd66d7 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 --------------------