Python Pi calculator created by oliverjam - https://repl.it/InIh/0

Python Pi calculator.py

from decimal import getcontext, Decimal

getcontext().prec = 20

def calculatePi():
  pi = Decimal(3)
  i = Decimal(2)
  while i < 20000000:
    divisor = Decimal(4) / Decimal(i * (i + 1) * (i + 2))
    if i % 4 == 0:
      pi -= divisor
    else:
      pi += divisor
    i += 2
  return pi

print(calculatePi())
print(Decimal(3.1415926535897932384626433832795028841971693993751058209))