[Python-Dev] fileobj.read(float): warning or error?

[Jesus Cea]

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Guido van Rossum wrote:
> On Mon, Jul 21, 2008 at 10:37 PM, Cameron Simpson <cs at zip.com.au> wrote:
>> Leaving aside the 0.2 => 0 converstion, shouldn't read() raise an
>> exception if asked for < 1 bytes? Or is there a legitimate use for read(0)
>> with which I was not previously aware?
> 
> Indeed. read(0) is quite often generated as an edge case when one is
> computing buffer sizes, and returning an empty string is most
> definitely the right thing to do here (otherwise some application code
> becomes more complex by having to avoid calling read(0) at all).

How do you differenciate between that empty string (when doing
"read(0)"), from EOF (that is signaled by an empty string)?.

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