Determining if file is valid image file

[Larry Bates]

André wrote:
> On Aug 2, 11:14 am, André <andre.robe... at gmail.com> wrote:
>> Other than installing PIL, is there a "simple" way using Python only
>> to determine if a file is a valid image file?
>>
>> I'd be happy if I could at least identify valid images files for gif,
>> jpeg and png.   Pointers to existing modules or examples would be
>> appreciated.
>>
>> The reason why I'd prefer not using PIL is that I'd like to bundle
>> such a function/module in my app.
>>
>> André
> 
> I should have added: I'm interesting in validating the file *content*
> - not the filename :-)
> 
And what's wrong with bundling PIL in your application?

-Larry