python中求平方根的方法

import math

num = 10

num_sqrt = math.sqrt(num)

print(f'{num} square root is {num_sqrt}')

>>> pow(12, 2)          # 求平方

144

>>> pow(144, .5)        # 求平方根

12.0

>>>

x = int(input())

low, high, ans = 0, x, -1

while low <= high:

    mid = (low + high) // 2

    if mid * mid <= x:

        ans = mid

        low = mid + 1

    else:

        high = mid - 1

print(ans)