How does Python express the root operation?

Square root, also called quadratic root, is expressed as [√￣], for example: in mathematical language: √￣16=4. The language description is: 16=4 under the root sign.

The following example is for the user to input a number and calculate the square root of this number:

# -*- coding: UTF-8 -*- 
 # Filename : test.py
num = float(input('请输入一个数字： '))
num_sqrt = num ** 0.5
print(' %0.3f 的平方根为 %0.3f'%(num ,num_sqrt))

The output result of executing the above code is:

$ python test.py 
请输入一个数字： 4
 4.000 的平方根为 2.000

In this example, we pass The user enters a number and the exponent operator ** is used to calculate the square root of the number.

This program only works with positive numbers. Negative numbers and complex numbers can be used in the following ways:

Example (Python 3.0)

# -*- coding: UTF-8 -*- 
 # Filename : test.py
# 计算实数和复数平方根
# 导入复数数学模块 
 import cmath 
num = int(input("请输入一个数字: "))
num_sqrt = cmath.sqrt(num)
print('{0} 的平方根为 {1:0.3f}+{2:0.3f}j'.format(num ,num_sqrt.real,num_sqrt.imag))

The output result of executing the above code is:

$ python test.py 
请输入一个数字: -8
-8 的平方根为 0.000+2.828j

In this example, we use cmath ( complex math) module's sqrt() method.

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