mpzpi.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Demo » scripts » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » Demo » scripts » mpzpi.py
#! /usr/bin/env python
# Print digits of pi forever.
#
# The algorithm, using Python's 'long' integers ("bignums"), works
# with continued fractions, and was conceived by Lambert Meertens.
#
# See also the ABC Programmer's Handbook, by Geurts, Meertens & Pemberton,
# published by Prentice-Hall (UK) Ltd., 1990.

import sys
from mpz import mpz

def main():
  mpzone, mpztwo, mpzten = mpz(1), mpz(2), mpz(10)
  k, a, b, a1, b1 = mpz(2), mpz(4), mpz(1), mpz(12), mpz(4)
  while 1:
    # Next approximation
    p, q, k = k*k, mpztwo*k+mpzone, k+mpzone
    a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
    # Print common digits
    d, d1 = a/b, a1/b1
    while d == d1:
      output(d)
      a, a1 = mpzten*(a%b), mpzten*(a1%b1)
      d, d1 = a/b, a1/b1

def output(d):
  # Use write() to avoid spaces between the digits
  # Use int(d) to avoid a trailing L after each digit
  sys.stdout.write(`int(d)`)
  # Flush so the output is seen immediately
  sys.stdout.flush()

main()
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