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gorakhargosh/pi.py

Last active September 25, 2015 14:53
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How to calculate pi, slowly.
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pi.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from __future__ import division
def term(i):
# n = 4.0/(2*i + 1)
# return -n if i & 1 else n
return (-1)**i * 4.0/(2*i + 1)
def pi(n):
"""Pi up to n terms."""
return sum(map(term, xrange(n)))
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