def math(m):
    y = pow(m, 6)-m-1  # 定义初始函数：f(x)=0 型
    return y


a = 1
b = 2
n = 100
c = 0.5e-3
for k in range(0, n):
    x = (a+b)/2
    y0 = math(x)
    y1 = math(a)
    d = y0*y1
    print('k={:<4} a={:<{width}} b={:<{width}} Xk={:<{width}} f(x)={}'.format(k, a, b, x, y0, width=15))
    if d == 0:
        print('k={:<4} a={:<{width}} b={:<{width}} Xk={:<{width}} f(x)={}'.format(k, a, b, x, y0, width=15))
    elif d < 0:
        b = x
    else:
        a = x
    if abs(b-a) < c:
        break
    if k == n:
        print('迭代次数达到设置上限')