Example: For positive numbers
num = 8
#num = float(input('Enter a number: '))
num_sqrt = num ** 0.5 print('The square root of %0.3f is %0.3f'%(num ,num_sqrt)) Run Code 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
import cmath
num = 1+2j
#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)) Run Code 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.