pi

from timeit import timeit
from decimal import *
getcontext().prec = 200
print ("A PI értékének számítása folyamatban...")
def calc (prec = 100):
    pi = Decimal(0)
    for k in range (prec):
        pi = pi + Decimal( (1/(16**k))*( (4/(8*k+1))-(2/(8*k+4))-(1/(8*k+5))-(1/(8*k+6)) ) )
    print (pi)
print (timeit(calc, number = 1))