为什么我的缩略图PIL功能第二次不起作用？

Question

 def create_thumbnail(f, width=200, height=100): im = Image.open(f) im.thumbnail((width, height), Image.ANTIALIAS) thumbnail_file = StringIO() im.save(thumbnail_file, 'JPEG') thumbnail_file.seek(0) return thumbnail_file 

It seems that my error is "IOError: cannot identify image file"...based on my traceback log.

Answer 1

The only thing I can think of is that you are running on Windows, in which case Image.open() will open a file handler but does not close it. (That behaviour does not occur on Linux/Unix - the file is closed by the end of your code, and it doesn't matter if it isn't anyway).