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#!/usr/bin/env python

# coding=utf-8

"""

solving a quadratic equation

"""

import math

def quadratic_equation(a,b,c):

delta = b*b - 4*a*c

if delta<0:

return False

elif delta==0:

return -(b/(2*a))

else:

sqrt_delta = math.sqrt(delta)

x1 = (-b + sqrt_delta)/(2*a)

x2 = (-b - sqrt_delta)/(2*a)

return x1, x2

if __name__ == "__main__":

print("a quadratic equation: x^2 + 2x + 1 = 0")

coefficients = (1, 2, 1)

roots = quadratic_equation(*coefficients)

if roots:

print("the result is:{}".format(roots))

else:

print("this equation has no solution.")