#!/usr/bin/python3

from math import sqrt as rsqrt
from cmath import sqrt as csqrt

print("I am going to compute the square root of 8")
sqrt = rsqrt(8)
print("The result is", sqrt)


print("I am going to compute the square root of -4")
sqrt = csqrt(-4)
print("The result is", sqrt)

# Note that ``callable(obj)`` returns whether ``obj`` is a 
# callable, i.e. is a function or method or has a ``__call__`
# method.