[Python-checkins] cpython (3.2): Code simplification suggested by Sven Marnach.

[raymond.hettinger]

http://hg.python.org/cpython/rev/9216e0a5d950
changeset:   70949:9216e0a5d950
branch:      3.2
parent:      70945:567236a7122c
user:        Raymond Hettinger <python at rcn.com>
date:        Sat Jun 25 11:30:53 2011 +0200
summary:
  Code simplification suggested by Sven Marnach.

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


diff --git a/Lib/random.py b/Lib/random.py
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -402,11 +402,9 @@
         # 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 --------------------
 

-- 
Repository URL: http://hg.python.org/cpython