Python matplotlib-图像标题不在循环中显示

在下面的函数中 img_list [image, image_title] .

def display_images(img_list, cmap='gray', cols = 2, fig_size = (10, 10) ):
    """
    Display images in img_list
    """
    i = 1  # for subplot

    num_images = len(img_list)
    num_rows = num_images / cols

    plt.figure(figsize=fig_size)       

    for image in img_list:
        image_file_name = image[1]
        plt.subplot(num_rows, cols, i)        
        plt.title = image_file_name
        plt.imshow(image[0], cmap=cmap)        
        i += 1     

    plt.show()

谢谢