 # Python Program to Find the Square Root

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 the following Python programming topics:

## Example: For positive numbers

``````# Python Program to calculate the square root

# Note: change this value for a different result
num = 8

# 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.

## Source code: For real or complex numbers

``````# Find square root of real or complex numbers
# Importing the complex math module
import cmath

num = 1+2j

# 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.

Note: If we want to take complex number as input directly, like `3+4j`, we have to use the `eval()` function instead of `float()`.

The `eval()` method can be used to convert complex numbers as input to the `complex` objects in Python. To learn more, visit Python eval() function.

Also, notice the way in which the output is formatted. To learn more, visit string formatting in Python.