Re: Ruby and Python YAML 1.{0,1} Compatibility

Anders,

Ruby 1.9 has support for Psych which uses libyaml. Python uses libyaml,
which is 1.1.

Abandoning libsyck in favor of libyaml is generally our advice here.

Please try Psych on Ruby, and let us know if this fixes things. I think it
will.

- Ingy

On Tue, Jul 27, 2010 at 2:40 AM, Anders Arpteg <[email protected]>wrote:

> Hi,
>
> We are having problem with the Ruby and the Python implementation of
> YAML. Ruby seems to be YAML 1.0 and Python shall be YAML 1.1
> compatible. Hopefully, one would wish that the Python implementation
> was backward compatible and able to parse Ruby encoded data. However,
> that seems not to be the case. See example below.
>
> I have tried with the PySyck module that is YAML 1.0 compatible, and
> it can then parse the Ruby YAML. However, that project seems abandoned
> and seems to have problems with certain python versions. Anyone with
> similar problems, and possible solutions?
>
> This cause serious problems for us and it seems very strange that YAML
> is not even backwards compatible. Perhaps we have to switch to JSON or
> some other format to overcome this problem, but hopefully have I
> overlooked some issue/solution that someone in this mailing list can
> help me with.
>
> Thanks in advance!
> Anders
>
> Ruby 1.9.0:
>
> >> require 'yaml'
> => []
> >> YAML.dump('å')
> => "--- !binary |\nw6U=\n\n"
>
> Python 2.6.5:
>
> >>> import yaml
> >>> yaml.safe_load("--- !binary |\nw6U=\n\n")
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/lib/python2.6/dist-packages/yaml/__init__.py", line 75,
> in safe_load
>    return load(stream, SafeLoader)
>  File "/usr/lib/python2.6/dist-packages/yaml/__init__.py", line 58,
> in load
>    return loader.get_single_data()
>  File "/usr/lib/python2.6/dist-packages/yaml/constructor.py", line
> 42, in get_single_data
>    node = self.get_single_node()
>  File "/usr/lib/python2.6/dist-packages/yaml/composer.py", line 39,
> in get_single_node
>    if not self.check_event(StreamEndEvent):
>  File "/usr/lib/python2.6/dist-packages/yaml/parser.py", line 93, in
> check_event
>    self.current_event = self.state()
>  File "/usr/lib/python2.6/dist-packages/yaml/parser.py", line 169, in
> parse_document_start
>    self.peek_token().start_mark)
> yaml.parser.ParserError: expected '<document start>', but found
> '<scalar>'
>  in "<string>", line 2, column 1:
>    w6U=
>    ^
> >>>
>
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