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.
For more Python related technical articles, please visit the Python Tutorial column to learn!
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