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Python square root Code Example

Last Updated on Wednesday 5th Oct 2022

A square root of a number is a value that gives the original number when multiplied by itself.

For example, 2 x 2 = 4, so a square root of 4 is 2. -2 x -2 = 4.

square root in python

Create a function that takes one argument as the input from the user.
Then, if the number is negative, it returns nothing.
As a square root of a number is simply the number raised to the power.
This will give us the square root of the number and print out the result to the user

Example 1 : Using Exponent

			
					n = int(input("Input : "))

def sqrt(n):
  if n < 0:
    return
  else:
    return n**0.5

print("The square root of", n, "is", sqrt(n))

			
					# Input : 25
# The square root of 25 is 5.0

Example 2 : Using Math.sqrt()

The sqrt() method returns the square root of the number x.
Math.sqrt() cannot be accessed directly. You need to import the math module.

			
					import math

import math
print(math.sqrt(100))
print(math.sqrt(36))
print(math.sqrt(math.pi))

			
					# 10.0
# 6.0
# 1.7724538509055159

Example 3

			
					n = int(input("Input : "))

def sqrt(n):
    # number entered stored as x, x is a variable carrying entered number
    x = n
    # y store x + 1 divided by 2 based on 
    y = (x + 1) / 2
    while y < x:
        x = y
        y = (x + n / x) / 2
    return y;
print("Square root of", n,sqrt(n))

			
					# Input : 49
# Square root of 49 is 7.0