Issue #21470: Do a better job seeding the random number generator

to fully cover its state space.

1 files changed, 3 insertions, 1 deletions

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