From 23042cda40bdab21db36a92d5d2655046207f947 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 13 May 2014 22:13:40 -0700
Subject: Issue #21470: Do a better job seeding the random number generator to
 fully cover its state space.

---
 Lib/random.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'Lib/random.py')

diff --git a/Lib/random.py b/Lib/random.py
index 808175ab4a..174e755a02 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -105,7 +105,9 @@ class Random(_random.Random):
 
         if a is None:
             try:
-                a = int.from_bytes(_urandom(32), 'big')
+                # Seed with enough bytes to span the 19937 bit
+                # state space for the Mersenne Twister
+                a = int.from_bytes(_urandom(2500), 'big')
             except NotImplementedError:
                 import time
                 a = int(time.time() * 256) # use fractional seconds
-- 
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