In [6]:
def sum(n):
pi = 0
t = 1
i = 1
s = 1
while i < n:
pi = pi + t
i = i + 2
s = -s
t = s / i
return pi
n1 = 1000
print (4 * sum(n1))
n2 = 100000
print(4 * sum(n2))
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