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If you are having trouble and want to check if you photo is a JPEG, look at the writing under the photo in its file name. If it ends . jpg or . jpeg- then the file is a JPEG and will upload.
The general way of recognizing the type of file is by looking at its extension. But this isn't generally the case. This type of standard for recognizing file by associating an extension with a file type is enforced by some operating system families (predominantly Windows).
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 Form Post and is processed by the following code
...
incomming_image = self.request.get("img")
image = db.Blob(incomming_image)
...
I found mimetypes.guess_type, but it does not work for me.
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