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pi.py
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#! /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 def main(): k, a, b, a1, b1 = 2, 4, 1, 12, 4 while True: # Next approximation p, q, k = k*k, 2*k+1, k+1 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 = 10*(a%b), 10*(a1%b1) d, d1 = a//b, a1//b1 def output(d): # Use write() to avoid spaces between the digits sys.stdout.write(str(d)) # Flush so the output is seen immediately sys.stdout.flush() if __name__ == "__main__": main()
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