写一段一元二次方程的Python代码

a = float(input("请输入a的值："))
b = float(input("请输入b的值："))
c = float(input("请输入c的值："))

delta = b**2 - 4*a*c

if delta < 0:
print("该方程无实根")
elif delta == 0:
x = -b / (2*a)
print("该方程有唯一实根x=", x)
else:
x1 = (-b + delta**0.5) / (2*a)
x2 = (-b - delta**0.5) / (2*a)
print("该方程有两个实根x1=", x1, "，x2=", x2)