def my_square(n): x = 1.0 while 1: if x * x >= n: x=(x * x + (x - 1) * (x - 1)) / 2 for i in range(0.10): j = n / x x = (j + x) / 2 print '%.30f' % x break else: x = x + 1
小数点下30桁まで計算できる
