Python绘制双柱状图并显示数值

#定义函数来显示柱状上的数值
def autolabel(rects):
    for rect in rects:
        height = rect.get_height()
        plt.text(rect.get_x()+rect.get_width()/2.-0.2, 1.03*height, '%s' % float(height))


if __name__ == '__main__': 
    l1=[68, 96, 85, 86, 76,87, 95]
    l2=[85, 68, 79, 89, 94, 82,90]


    name=['A','B','C','D','E','F','E']
    total_width, n = 0.8, 2  
    width = total_width / n 
    x=[0,1,2,3,4,5,6]
    
    a=plt.bar(x, l1, width=width, label='数学',fc = 'y')  
    for i in range(len(x)):  
        x[i] = x[i] + width  
    b=plt.bar(x, l2, width=width, label='语文',tick_label = name,fc = 'r')
    
    autolabel(a)
    autolabel(b)
    
    plt.xlabel('学生')
    plt.ylabel('成绩')
    plt.title('学生成绩')
    plt.legend()

    plt.show()