Random and fork

Julien Le Goff julien.legoff at gmail.com
Thu Feb 7 10:41:05 CET 2013


Thank you for the answers! It was much simpler than I thought.

On Wednesday, 6 February 2013 17:49:06 UTC+1, Alain Ketterlin  wrote:
> Julien Le Goff <julien.legoff at gmail.com> writes:
> 
> 
> 
> > Today I came accross a behaviour I did not expect in python (I am
> 
> > using 2.7). In my program, random.random() always seemed to return the
> 
> > same number; it turned out to be related to the fact that I was using
> 
> > os.fork.
> 
> 
> 
> The random number generator is initialized once, when the module is
> 
> first imported. Forking simply duplicates the process in its current
> 
> state, so no reinitilization occurs, both (or all) processes' generators
> 
> are in the same state, and therefore generate the same sequence.
> 
> 
> 
> -- Alain.




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