# How to Calculate Square Root in Python using sqrt() Function

To find out the square root in Python Programming Language you can use `math.sqrt()` function of Standard Library.

## Python `sqrt()` Function

`math.sqrt()` function exists in Standard math Library of Python Programming Language. The purpose of this function is to calculate squar root of a given value `x`. `x` must be greater than zero (x>0).

## Python `sqrt()` Function Syntax

The syntax of sqrt function in python is:
`math.sqrt( x )`

## Python `sqrt()` Function Parameters

`x` – Any valid Python positive number. This parameter is required.
Note: if the `x` parameter is not a number returns an error.

Python 2.x – Yes
Python 3.x – Yes

## Python `sqrt()` Return Value

`sqrt()` function will return an integer or a floating point number after calculating squar root. The return value will always be greater than zero.

## Python `sqrt()` Function Examples

```# import math library
import math
print (math.sqrt(0))
print (math.sqrt(4))
print (math.sqrt(5.5))
print (math.sqrt(-2.9))
```

Output of Python `sqrt()` function:
``` 0.0 2.0 2.345207879911715 ValueError: math domain error ```