pi_calculator.py

#Nur Tabs

from time import *
from _thread import start_new_thread

t1 = clock()
t2 = clock()

def	exact(precision):
	t1 = clock()
	terms = 1
	if(precision == 3-1):
		terms = 2000
	if(precision == 4-1):
		terms = 135000
	if(precision == 5-1):
		terms = 376500
	if(precision >= 6-1 ):
		terms = 1000000000
	unverseit = 0
	last = 0.0
	print("Terms/Start>>>" + str(terms))
	while(unverseit < 4):
		tmpi = leibniz(terms)
		tmp1 = int(tmpi * (10 ** (precision + 1)))
		tmp_last1 = int(last * (10 ** (precision + 1)))
		if(tmp1 == tmp_last1):
			unverseit += 1
			print("\n+1 " + "\n---\n" + str(tmpi) + "\n" + str(tmp1) + "\n---\n")
		else:
			unverseit=0
			if(terms % 1000 == 0):
				print(str(terms) + "\n" + str(tmp1) + " != " + str(tmp_last1))
		terms += 1
		last = tmpi
	print("\n!-!-!-!\nFinish\n!-!-!-!\n")
	print("\nTerms > " + str(terms) + "\nPi > " + str(tmpi))
	t2 = clock()
	t = t2 - t1
	print("%.2fs" % (t))
	
def	leibniz(terms):				
	result = 0.0
	sign = 1.0
	for n in range(terms):
		result += sign/(2.0*n+1.0)
		sign = -sign
	return 4 * result

while True:
	precision = int(input("Precision: "))
	exact(precision - 1)

It uses the Leibniz algorithm (https://en.wikipedia.org/wiki/Leibniz_formula_for_%CF%80) to calculate pi. You can enter the precision of pi so for example 3 -> It will calculate to the third place after the comma exactly.