def simple_sqrt(v, t):
if v < 0:
raise ValueError('domain error')

if v == 0:
return 0

# binary search
if v < 1:
left, right = v, 1
else:
left, right = 0, v
while True:
mid = (left + right) / 2.0
dest = mid * mid
diff = dest - v

if diff > 0 and (mid - t) * (mid - t) <= v:
return mid
if diff < 0 and (mid + t) * (mid + t) >= v:
return mid
if diff == 0:
return mid

if diff > 0:
right = mid
else:
left = mid

@tkin1992 加Q聊吧：156669271

北京的机会考虑吗

@dxb848295325 招应届生，感兴趣发简历给我

@hww 抱歉目前不提供实习岗位

@Giinez 嗯，好多小伙伴儿的第一反应都是这个

@onedayoneapple 没有上海职位