from decimal import * #Sets decimal to 25 digits of precision getcontext().prec = 25 def factorial(n): if n<1: return 1 else: return n * factorial(n-1) def chudnovskyBig(n): #http://en.wikipedia.org/wiki/Chudnovsky_algorithm pi = Decimal(0) k = 0 while k < n: pi += (Decimal(-1)**k)*(Decimal(factorial(6*k))/((factorial(k)**3)*(factorial(3*k)))* (13591409+545140134*k)/(640320**(3*k))) k += 1 pi = pi * Decimal(10005).sqrt()/4270934400 pi = pi**(-1) return pi print("\t\t\t Plouff \t\t Bellard \t\t\t Chudnovsky") for i in xrange(1,20): print("Iteration number ",i, " ", chudnovskyBig(i)
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