Wow, I never even guessed Guido had anything to do with this code. The world shrinks again!
Fun! Kirby On Tue, Sep 29, 2015 at 9:41 AM, Tim Peters <tim.pet...@gmail.com> wrote: > Copying Guido because he's the actual original author of this code. I > remember it being in a very early intro to Python, which I can't find > now. And it used to be included in a Python distribution's Demo > directory. But, e.g., you can see it in this mailing list message > from Guido in 1994, during an early discussion of what eventually > became Python's generators. Guido, do you remember where this > algorithm came from? > > http://legacy.python.org/search/hypermail/python-1994q2/0429.html > scroll down to point "6)" > > [kirby urner <kirby.ur...@gmail.com>] > > I'm still interested in finding more bibliographic sources for this one, > not > > necessarily in Python syntax i.e. did Euler come up with this or who? > > > > > > def pi_digits(): > > > > k, a, b, a1, b1 = 2, 4, 1, 12, 4 > > while True: > > p, q, k = k*k, 2*k+1, k+1 > > a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1 > > d, d1 = a/b, a1/b1 > > while d == d1: > > yield int(d) > > a, a1 = 10*(a%b), 10*(a1%b1) > > d, d1 = a/b, a1/b1 > > > > [ http://mail.python.org/pipermail/edu-sig/2012-December/010728.html ] > > > >>>> pi = pi_digits() > >>>> "".join([str(next(pi)) for i in range(100)])) > > > '3141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067' > > > > ... so far what we know is some high school student handed it in for > > homework. >
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