Re: [PyYAML] problems with nested mappings

A YAML mapping is constructed lazily, so `construct_mapping()` may 
return an empty dictionary to be populated later.  To get a complete 
dictionary, use `loader.construct_mapping(node, deep=True)`.

On 10/01/2012 03:25 PM, Manlio Perillo wrote:
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> Hash: SHA1
>
> Hi.
>
> I don't understand why this script:
>
> ## BEGIN
> from yaml import add_constructor, load, __version__
>
>
> def test_constructor(loader, node):
>      kwargs = loader.construct_mapping(node)
>      print kwargs
>      return kwargs
> add_constructor(u'!test', test_constructor)
>
>
> sample = """
> bar: !test
>    a: b
>    foo:
>      x: 1
> """
>
>
> print __version__
> print load(sample)
> ## END
>
> Produce, as output:
>
>    3.10
>    {'a': 'b', 'foo': {}}
>    {'bar': {'a': 'b', 'foo': {'x': 1}}}
>
> I was expecting:
>
>    3.10
>    {'a': 'b', 'foo': {'x': 1}}
>    {'bar': {'a': 'b', 'foo': {'x': 1}}}
>
>
>
> Thanks  Manlio Perillo
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