Python实现求解一元二次方程的方法示例

# -*- coding:utf-8 -*-
#! python2
import math
class Result:
  result1 = 0
  result2 = 0
  def __init__(self, r1, r2):
    self.result1 = r1
    self.result2 = r2
  def __return__(self):
    return Result(self.result1, self.result2)
def main(a, b, c):
  num = b*b-4*a*c
  if num < 0:
    return 'no result'
  elif num == 0:
    return Result((-b+math.sqrt(num))/(2*a), (-b+math.sqrt(num))/(2*a))
  else:
    return Result((-b+math.sqrt(num))/(2*a), (-b-math.sqrt(num))/(2*a))
if __name__ == '__main__':
  result = main(1, 2, 1)
  print result.result1, result.result2