How to Find Square Root of a Number Using Python
The below article demonstrates different ways to find the Square Root of a Number using Python programming language.
In Python programming, there are various predefined methods to calculate the square root of a number. And in this article, we will discuss 4 different ways to find the square root of positive, negative, real as well as complex numbers. So, without further ado, letβs begin!
Also Read: Introduction to Python β Features, Use Cases, Resources, and Applications
We will be covering the following sections today:
What is a Square Root?
The square root is a factor of a number that, when multiplied by itself, returns the number itself. For example, the square root of 49 is 7, because 7 x 7 = 49. Similarly, 3 is a square root of 9, since 3 x 3 = 9. Also, it is interesting to note that -3 x -3 = 9 as well, so -3 is also a square root of 9!
Methods to Find Square Root of a Number in Python
Using math module β sqrt()
We have an in-built square root function in the Python math library, called sqrt(), that directly returns the square root of any number when applied to it:
#Import the math library import math #Print the square root of 36 print("Square root of 36 is: ", math.sqrt(36)) #Print the square root of 6 print("Square root of 6 is: ",math.sqrt(6)) #Print the square root of 1.5 print("Square root of 1.5 is: ",math.sqrt(1.5))
Output:
We can also take input from the user and display its square root. The number can be an integer as well as a float value:
#Import the math library import math #Enter input num = float(input("Enter numeric value : ")) squareRoot = math.sqrt(num) print("The Square Root of {0} is: {1}".format(num, squareRoot))
Output:
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Using math module β pow()
We have another in-built function in the Python math library that can be used to find the square root of a number β the pow() method.
It takes 2 arguments as input β the number and the power of that number. We can use it to find the square root of a number by applying a power of 0.5 to it, as shown:
#Import the math library import math #Enter input num = float(input("Enter numeric value : ")) squareRoot = math.pow(num, 0.5) print("The Square Root of {0} is: {1}".format(num, squareRoot))
Output 1:
Output 2:
Using arithmetic operator β exponent
On the same lines as the previous method, we can find the square root of a number by simply exponentiating it to the power of 0.5 using the exponent (**) operator, as shown:
#Import the math library import math #Enter input num = float(input("Enter numeric value : ")) squareRoot = num ** 0.5 print("The Square Root of {0} is: {1}".format(num, squareRoot))
Output:
Using cmath module β sqrt()
In this method, we use the sqrt() function of the cmath module to calculate the square root of a real or complex number in Python. this method is specifically used for negative or complex numbers:
#Import the cmath library import cmath #Enter input num = eval(input("Enter numeric value : ")) squareRoot = cmath.sqrt(num) print("The Square Root of {0} is: {1}".format(num, squareRoot))
Output 1:
Output 2:
Endnotes
With this, we have come to the end of our article. Hope this was helpful for you to understand how to find the square root of a number using different methods in Python. Want to learn more about Python and practice Python programming? Explore related articles here.
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