Python 写二次公式

Question

我想尝试让我的打印函数自动用测试中分配给这些变量的值之一替换变量“a”、“b”和“c”。我该怎么做？我理想的输出看起来像这样方程:1x**2 + 4x + 4一根。2.0

import math

def quadraticRoots(a,b,c):
    print('Equation: ax**2 + bx + c')    # (this is what I am trying and it doesn't work)
    discriminant = b**2 - 4 * a * c
    if discriminant > 0:
        root1 = float(-b + math.sqrt(b**2 - 4 * a * c))/ (2 * a)
        root2 = float(-b - math.sqrt(b**2 - 4 * a * c))/ (2 * a)
        print('Two roots.')
        print(root1)
        print(root2)
    elif discriminant == 0:
        root1 = float(-b + math.sqrt(b**2 - 4 * a * c))/ (2 * a)
        print('One root.')
        print(root1)
    elif discriminant < 0:
        print('No roots.')

def test():
    quadraticRoots(1,0,0)
    quadraticRoots(2,-11,-21)
    quadraticRoots(4,1,4)
    quadraticRoots(1,2,8)
    quadraticRoots(3,-11,19)
    quadraticRoots(1,4,4)
    quadraticRoots(16,-11,64)
    quadraticRoots(1,18,81)
    quadraticRoots(1,7,42)
    quadraticRoots(5,10,5)

test()

Answer 1

尝试以下操作:

print('Equation: {0}x**2 + {1}x + {2}'.format(a,b,c))