square_root.py

from sys import argv

IN = float(argv[1])
PRECISION = 0.000000001

if IN == 1:
	i = 1
	
elif IN > 1:
	i = IN/2
	size = i
	sq = i**2

	while abs(sq-IN)>PRECISION:
		# print(i)#debug
		size/=2

		if sq > IN:
			i= i - size
		else:
			i= i + size
		sq = i**2

else:
	size = (1 - IN)/2
	i = IN + size
	sq = i**2


	while abs(sq-IN)>PRECISION:
		# print(i)#debug
		# __import__("time").sleep(1)
		size/=2
		if sq > IN:
			i= i - size
		else:
			i= i + size
		sq = i**2




print(i)