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# -*- coding: UTF-8 -*-

# Filename : test.py
# author by : www.tutorialpro.org

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))

$ python test.py 
Please enter a number: 4
The square root of 4.000 is 2.000

# -*- coding: UTF-8 -*-

# Filename : test.py
# author by : www.tutorialpro.org

# Calculate the square root for real and complex numbers
# Import the complex math module

import cmath

num = int(input("Please enter a number: "))
num_sqrt = cmath.sqrt(num)
print('The square root of {0} is {1:0.3f}+{2:0.3f}j'.format(num, num_sqrt.real, num_sqrt.imag))

$ python test.py 
Please enter a number: -8
The square root of -8 is 0.000+2.828j