python - how can I display a image from web?

I'm using Python to make a "web album viewer", but I meet some problem.

I use Tkinter to write GUI, urllib2 to fetch the image from web, PIL to handle the image

So the code is like this:

root = Tk()
frame = Frame(root)
frame.pack()
response = urllib2.urlopen(a_pic_url)
photo = ImageTk.PhotoImage(Image.open(response.read()))
label = Label(frame, image = photo)
label.pack()

it fails, and throws the following error message:

TypeError: file开发者_运维技巧() argument 1 must be (encoded string without NULL bytes), not str

How can I overcome this?

Thanks, and I'm sorry for my poor English.

Image.open takes a filename or a file object, not a str which is what is returned by read.

Either save the image to a file then open that, or use Image.open(response), to use it directly on the file-like objected returned by urlopen.

Edit: This should work if you're having trouble with the urlopen object:

try:
    from io import BytesIO
except ImportError:
    from cStringIO import StringIO as BytesIO #works on on old versions of Python

response = urllib2.urlopen(a_pic_url)
photo = ImageTk.PhotoImage(file=BytesIO(response.read()))

There's nothing wrong with your English. There's a slight error in your code. It should be:

 photo = ImageTk.PhotoImage(Image.open(response))

The .read() part was messing with you.

That's because when using Image.open() PIL waits for a filename, and what you gave is the content of the image file. Try to save the image before :

root = Tk()
frame = Frame(root)
frame.pack()
response = urllib2.urlopen(a_pic_url)
open(image_file_name, "wb+").write(response.read())
photo = ImageTk.PhotoImage(file=image_file_name)
label = Label(frame, image = photo)
label.pack()