IO Gurus: what are the differences between these two methods?

[Ulrich Eckhardt]

dpapathanasiou wrote:
> I have two methods for writing binaries files: the first works with
> data received by a server corresponding to a file upload, and the
> second works with data sent as email attachments.

Hmmm, no. Looking at your code, the first of your functions actually treats
its argument as a stream, while the second one treats it like a byte buffer
(as str object, to be precise).

> The odd thing is, they're not interchangeable: if I use the first one
> to saved data parsed from an email attachment, it fails; similarly,
> the second function fails when dealing with an uploaded file data.

There is nothing odd about that, they are different functions working with
different things.

> What are the critical differences?
> 
> def write_binary_file (folder, filename, f, chunk_size=4096):
[...]
>             for file_chunk in read_buffer(f, chunk_size):
>                 file_obj.write(file_chunk)
[...]
> def write_binary_file (folder, filename, filedata):
[...]
>             file_obj.write(filedata)

BTW: You could have reduced the code yourself before posting. You might have
seen the difference yourself then! Further, I'm curious, do you have any
non-binary files anywhere? =)

Uli

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