def pi():
prompt=">>> "
print "
WARNING: Pi may take some time to be calculated and may not always be correct beyond 100 digits."
print "
Show Pi to what digit?"
n=raw_input(prompt)
from decimal import Decimal, localcontext
with localcontext() as ctx:
ctx.prec = 10000
pi = Decimal(0)
for k in range(350):
pi += (Decimal(4)/(Decimal(8)*k+1) - Decimal(2)/(Decimal(8)*k+4) - Decimal(1)/(Decimal(8)*k+5) - Decimal(1)/(Decimal(8)*k+6)) / Decimal(16)**k
print pi[:int(n)]
pi()
Traceback (most recent call last):
File "/Users/patrickcook/Documents/Pi", line 13, in <module>
pi()
File "/Users/patrickcook/Documents/Pi", line 12, in pi
print pi[:int(n)]
TypeError: 'Decimal' object has no attribute '__getitem__'
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