(Python Tutorials for Citizen Data Scientist)
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.
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.
Notice that we have used the eval() function instead of float() to convert complex numbers as well. Also, notice the way in which the output is formatted.
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Python Examples for Beginners: Python Code to Find the Square Root
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