Python: Check if uploaded file is jpg

Question

How can I check if a file uploaded by a user is a real jpg file in Python (Google App Engine)?

This is how far I got by now:

Script receives image via HTML F

Answer 1

Use PIL. If it can open the file, it's an image.

From the tutorial...

>>> import Image
>>> im = Image.open("lena.ppm")
>>> print im.format, im.size, im.mode