oh i see - you were computing "e" - in today's hardware / symbolic python libraries that's much much faster.

####

from sympy import var, Sum, factorial, oo

from datetime import datetime

import platform as pt

t0 = datetime.now()

var('n x'); precision = 50

ans = Sum(1/factorial(n), (n, 0, 69)).evalf(precision)

print ('ans = ', ans, '\ntime (mu-s) = ', (datetime.now()-t0).microseconds, '\nprocessor = ', pt.processor(), pt.machine())

#####

ans = 2.7182818284590452353602874713526624977572470937000

time (mu-s) = 75395

processor = i386 x86_64