Does shuffle() produce uniform result ?

tooru honda tooru_honda at fast-mail.org
Sat Aug 25 14:35:52 CEST 2007


At the end, I think it is worthwhile to implement my own shuffle and 
random methods based on os.urandom.  Not only does the resulting code 
gets rid of the minuscule bias, but the program also runs much faster.

When using random.SystemRandom.shuffle, posix.open and posix.close from 
calling os.urandom account for almost half of the total execution time 
for my program.  By implementing my own random and getting a much larger 
chunk of random bytes from os.urandom each time, I am able to reduce the 
total execution time by half.

-tooru honda

P.S. I use python 2.5.1 on MacOSX 10.4.10 (PowerPC).



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