Python 程序无法识别输入

Question

我有一个程序应该将图像转换为具有透明边框的方形 png（如果图像为 1000x1500，则 png 为 1500x1500，然后图像将放置在 png 的中间，创建透明边框250x1500 两侧）。该程序应该从我可以选择要从中导入的文件夹中导入图像，然后将其导出到您也可以选择的另一个文件夹中。我使用递归从文件夹中抛出所有图像，但是它说输入无法识别。谁能帮我解决这个问题？在我现在发送的代码中，你有你需要解释的一切：

from PIL import Image
from os import listdir
from os.path import isfile, join,splitext

Folder_Input = 'D:\\0Pi_\Downloads\ScpServer\Originais'                         #directory where we will upload images
Folder_Output ='D:\\0Pi_\Downloads\ScpServer\PNGs'                              #directory where we will save images

typelist = ['.png','.jpg','.jpeg']
images_list = [f for f in listdir(Folder_Input) if isfile(join(Folder_Input, f)) and splitext(f)[1].lower() in typelist]

for im in images_list:
    try:
        image = Image.open(im)                                                  #this is supposed to open the image, however it doesn't. what's missing
    except:
        print(f'Problem opening image{im}!\n')
        image.close()
        continue
    width, height = image.size
    
    if height >= width:
        new_width = height
        new_height = height
    else:
        new_width = width
        new_height = width

    result = Image.new(mode = 'RGBA', size = (new_width, new_height) ,color = (0,0,0,0))   #creates a new transparent squared png
    offset = ((new_width - width) // 2, (new_height - height) // 2)             #centers the image in relation to the squared png
    
    result.paste(image,offset)                                                  #unites both the image and the squared layer
    image.close()                                                               #closes the file now finished
    
    output_file = join(Folder_Output,splitext(im)[0] + '.png')
    if not isfile(output_file):
        result.save(output_file)                                                #saves file on the output folder
    else:
        print(f"The file {splitext(im)[0] + '.png'} was not saved because it already exists on {Folder_Output}!\n")

这是 Tracebak：

Traceback (most recent call last):
  File "D:/0Pi_/Documents/add_borders.py", line 16, in <module>
    image.close()
builtins.NameError: name 'image' is not defined

Answer 1

如果try/except 块失败，它可能没有将对象分配给image 变量。

try:
    image = Image.open(im)  # this is supposed to open the image, however it doesn't. what's missing
except:
    print(f'Problem opening image{im}!\n')
    image.close() # will have problem here

因为，如果成功，您只查看Image.open(im)，只需从except 中删除image.close()，或者使用另一个try/except 关闭对象。可能im 不可读或路径错误，会导致失败。