[Python-3000] fix email module for bytes/str

[Guido van Rossum]

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On 8/8/07, Victor Stinner <victor.stinner at haypocalc.com> wrote:
> Hi,
>
> I started to work on email module, but I have trouble to understand if a
> function should returns bytes or str (because I don't know email module).
>
> Header.encode() -> bytes?
> Message.as_string() -> bytes?
> decode_header() -> list of (bytes, str|None) or (str, str|None)?
> base64MIME.encode() -> bytes?
>
> message_from_string() <- bytes?
>
> Message.get_payload() -> bytes or str?
>
> A charset name type is str, right?
>
> ---------------
>
> Things to change to get bytes:
>  - replace StringIO with BytesIO
>  - add 'b' prefix, eg. '' becomes b''
>  - replace "%s=%s" % (x, y) with b''.join((x, b'=', y))
>    => is it the best method to concatenate bytes?
>
> Problems (to port python 2.x code to 3000):
>  - When obj.lower() is used, I expect obj to be str but it's bytes
>  - obj.strip() doesn't work when obj is a byte, it requires an
>    argument but I don't know the right value! Maybe b'\n\r\v\t '?
>  - iterate on a bytes object gives number and not bytes object, eg.
>       for c in b"small text":
>          if re.match("(\n|\r)", c): ...
>    Is it possible to 'bytes' regex? re.compile(b"x") raise an exception
>
> --
> Victor Stinner aka haypo
> http://hachoir.org/
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)