In this program, you'll learn to find the square root of a number using exponent operator and cmath module.

To understand this example, you should have the knowledge of following Python programming topics:

# Python Program to calculate the square root # Note: change this value for a different result num = 8 # uncomment to take the input from the user #num = float(input('Enter a number: ')) num_sqrt = num ** 0.5 print('The square root of %0.3f is %0.3f'%(num ,num_sqrt))

**Output**

The square root of 8.000 is 2.828

In this program, we store the number in `num` and find the square root using the `**`

exponent operator. This program works for all positive real numbers. But for negative or complex numbers, it can be done as follows.

# Find square root of real or complex numbers # Import the complex math module import cmath # change this value for a different result num = 1+2j # uncommment to take input from the user #num = eval(input('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))

**Output**

The square root of (1+2j) is 1.272+0.786j

In this program, we use the `sqrt()`

function in the cmath (complex math) module.

Notice that we have used the `eval()`

function instead of `float()`

to convert complex number as well. Also notice the way in which the output is formatted.

Look here for more about string formatting in Python.