john7

Can numpy be used with pypy? Or are there plans for that?

No, Bayesian decision theory does not allow you to reason in that way.

Suppose the amounts in the envelopes are A and B. A Bayesian would say:

Prob(I have A) = 1/2 and Prob(I have B) = 1/2

The expected gain from switching is:

Prob(I have A)x(what I'd gain from switching = B-A) + Prob(I have B)x(what I'd gain from switching = A-B)

which is: 1/2 x (B-A) + 1/2 x (A-B) = 0

Why not to read more books:

http://ebooks.adelaide.edu.au/s/schopenhauer/arthur/lit/chap...

Having someone else do my laundry for about a dollar a pound. No more buying detergent, waiting around, having to find change if you don't have your own washer/dryer, loading/unloading, folding, etc.