[issue13600] rot_13 codec not working

[Petri Lehtinen]

Petri Lehtinen  added the comment:

Issue #7475 discusses fixing the error messages, too.

--
components: +Library (Lib)
resolution:  -> duplicate
stage: committed/rejected -> 
status: open -> closed
superseder:  -> codecs missing: base64 bz2 hex zlib hex_codec ...

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[issue13600] rot_13 codec not working

[Ram Rachum]

Ram Rachum  added the comment:

Then I suggest replacing this error message:

encoder did not return a bytes object (type=str)

and this one:

'memoryview' object has no attribute 'translate'

With something like:

Please use `codecs.lookup('rot-13').encode`

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assignee:  -> docs@python
components: +Documentation -Library (Lib)
nosy: +docs@python
resolution: invalid -> 
status: closed -> open

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[issue13600] rot_13 codec not working

[Petri Lehtinen]

Petri Lehtinen  added the comment:

Ram Rachum wrote:
> The `rot_13` codec is supposed to work like this, no?

No it isn't. In Python 3, str.encode() always encodes to bytes and 
bytes.decode() always decodes to str. IOW, str.encode() encodes text (Unicode) 
to data (bytes), and bytes.decode() decodes data to text. ROT-13 is not a 
character encoding, so it cannot be used in this manner.

It's still available in the codecs module, though:

>>> import codecs
>>> codecs.lookup('rot-13').encode('qwerty')
('djregl', 6)

Other text->text and bytes->bytes codecs are also available there.

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nosy: +petri.lehtinen
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed
type:  -> behavior

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[issue13600] rot_13 codec not working

[Ezio Melotti]

Ezio Melotti  added the comment:

See #7475.

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nosy: +ezio.melotti

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[issue13600] rot_13 codec not working

[Ram Rachum]

New submission from Ram Rachum :

The `rot_13` codec is supposed to work like this, no?

>>> 'qwerty'.encode('utf-8')
b'qwerty'
>>> 'qwerty'.encode('rot_13')
Traceback (most recent call last):
  File "", line 1, in 
'qwerty'.encode('rot_13')
TypeError: encoder did not return a bytes object (type=str)

>>> b'qwerty'.decode('utf-8')
'qwerty'
>>> b'qwerty'.decode('rot_13')
Traceback (most recent call last):
  File "", line 1, in 
b'qwerty'.decode('rot_13')
  File "C:\Python32\lib\encodings\rot_13.py", line 19, in decode
return (input.translate(rot13_map), len(input))
AttributeError: 'memoryview' object has no attribute 'translate'

--
components: Library (Lib)
messages: 149431
nosy: cool-RR
priority: normal
severity: normal
status: open
title: rot_13 codec not working
versions: Python 3.3

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