YouTipPython3 Square Root
# Python3.x Python Square Root
[ Python3 Examples](#)
The square root, also known as the second root, is represented as [βοΏ£]. For example, in mathematical language: βοΏ£16=4. In verbal description: the square root of 16 is 4.
The following example calculates the square root of a number entered by the user:
## Example (Python 3.0+)
```python
# -*- coding: UTF-8 -*-
# Filename : test.py
# author by : www..com
num = float(input('Please enter a number: '))
num_sqrt = num ** 0.5
print('The square root of %0.3f is %0.3f' % (num, num_sqrt))
The output of the above code is:
$ python test.py
Please enter a number: 4
The square root of 4.000 is 2.000
In this example, we take a number as input from the user and use the exponent operator `**` to calculate its square root.
This program only works for positive numbers. Negative numbers and complex numbers can be handled as follows:
## Example (Python 3.0+)
```python
# -*- coding: UTF-8 -*-
# Filename : test.py
# author by : www..com
# Calculate square root of real and complex numbers
# Import complex math module
import cmath
num = int(input("Please enter a number: "))
num_sqrt = cmath.sqrt(num)
print('{0} square root is {1:0.3f}+{2:0.3f}j'.format(num, num_sqrt.real, num_sqrt.imag))
The output of the above code is:
$ python test.py
Please enter a number: -8
-8 square root is 0.000+2.828j
In this example, we use the `sqrt()` method from the `cmath` (complex math) module.
[ Python3 Examples](#)