Re: PyYAML - Help with redefining to_yaml and multiple documents

Sean wrote:

> 
> 
>     I have a simple python class containing 2 dicts.  I'd like to
>     represent an instance of the class as two yaml documents, with the ---
>     document start token separating the 2 dicts.  I think I need to
>     redefine to_yaml to do this, but I'm not really sure how to get both
>     documents into the stream.
> 
>     import yaml
>     class Info(yaml.YAMLObject):
>        yaml_tag = u'Info'
>        def __init__(self):
>            self.firstDoc={1: 'one', 2: 'two', 3: 'three'}
>            self.secondDoc={4: 'four', 5: 'five'}
> 
>        @classmethod
>        def to_yaml(cls,dumper,data):
>            return dumper.represent_mapping(tag=u'tag:yaml.org
>     <http://yaml.org>,
>     2002:map',mapping=data.firstDoc)
> 
>     if __name__ == "__main__":
>        print yaml.dump(Info(),default_flow_style=False)
> 

You don't need to inherit your class from YAMLObject to do that. Just 
call yaml.dump_all() and pass it a list of the dictionaries:

info = Info()
print yaml.dump_all([info.firstDoc, info.secondDoc], 
default_flow_style=False)



Thanks,
Kirill

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