Python 为什么我会收到AttributeError:\uu getitem__

我目前正试图使文件夹中的所有图像50%半透明，我从列表中调用它们，我不知道现在该怎么办

def convertimg(directory = None):

    if directory == None:
       directory = os.getcwd() 

    # Create a new directory 'modified'
    new_directory = os.path.join(directory, 'modified')
    try:
        os.mkdir(new_directory)
    except OSError:
        pass # if the directory already exists, proceed  

    #load all the images
    image_list, file_list = get_imgs(directory)

    if directory == None:
       directory = os.getcwd() 
    image_list, file_list = get_imgs(directory)
    for n in range(len(image_list)):

        im = image_list[n]
        im = im.convert("RGBA")
        for row in range(0,420):
            for column in range(0,500):
               im[row][column][3] = 127
        new_image = im
        filename, filetype = file_list[n].split('.')
        #save the altered image, suing PNG to retain transparency
        new_image_filename = os.path.join(new_directory, filename + '.png')
        new_image.save(new_image_filename) 

错误是convertimg（）

---

在最后一行。

不要将

行

和

列

分别作为索引提供给

im

，而是尝试将它们作为单个索引连接起来

        im = im.convert("RGBA")
        for row in range(0,420):
            for column in range(0,500):
               im[row, column][3] = 127

 im = image_list[n]
            im = im.convert("RGBA")
            for row in range(0,420):
                for column in range(0,500):
                   im[row][column][3] = 127

        im = im.convert("RGBA")
        for row in range(0,420):
            for column in range(0,500):
               im[row, column][3] = 127