import math

def quadratic(a, b, c): d = b b - 4 a c if d < 0: return '此方程无解' elif d == 0: x = -b / (2 a) return x else: x1 = (-b + math.sqrt(d)) / (2 a) x2 = (-b - math.sqrt(d)) / (2 a)

    return x1, x2

print(quadratic(2, 3, 1))

测试

print('quadratic(2, 3, 1) =', quadratic(2, 3, 1)) print('quadratic(1, 3, -4) =', quadratic(1, 3, -4))

if quadratic(2, 3, 1) != (-0.5, -1.0): print('测试失败') elif quadratic(1, 3, -4) != (1.0, -4.0): print('测试失败') else: print('测试成功')