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benawad/n_degree_pi_mathmatically.py

Created November 14, 2014 16:45
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n_degree_pi_mathmatically.py
from __future__ import division
from decimal import *
print "Enter a number and I will print out that many decimal places of PI."
places = int(raw_input('>'))
getcontext().prec = places
pi = 0
for k in range(places):
pi += Decimal(16**-k) * ( Decimal(4/(8*k + 1)) - Decimal(2/(8*k + 4)) - Decimal(1/(8*k + 5)) - Decimal(1/(8*k + 6)) )
print "Here is" , places , "decimal places of PI:" , pi
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