Ticket #103 (closed defect: wontfix)

Opened 6 years ago

Last modified 9 months ago

example from http://yaml.org/type/yaml.html fails to parse

Reported by: py4fun@… Owned by: xi
Priority: low Component: pyyaml-legacy
Severity: minor Keywords:


example from  http://yaml.org/type/yaml.html fails to parse. Is it a wrong example ? (I have found already a few...)

>>> text = open('yaml.yaml').read()
>>> print text
# The following node should NOT be serialized this way.
encoded YAML node :
 !!yaml '!' : '!type'
 !!yaml '&' : 12
 !!value = : value
# The proper way to serialize the above node is as follows:
node : !type &12 value

>>> print yaml.load(text)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\tools\Python25\lib\site-packages\yaml\__init__.py", line 58, in load
    return loader.get_single_data()
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 44, in get_single_data
    return self.construct_document(node)
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 53, in construct_document
    for dummy in generator:
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 404, in construct_yaml_map
    value = self.construct_mapping(node)
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 214, in construct_mapping
    return BaseConstructor.construct_mapping(self, node, deep=deep)
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 139, in construct_mapping
    value = self.construct_object(value_node, deep=deep)
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 94, in construct_object
    data = constructor(self, node)
  File "C:\tools\Python25\lib\site-packages\yaml\constructor.py", line 420, in construct_undefined
yaml.constructor.ConstructorError: could not determine a constructor for the tag '!type'
  in "<string>", line 7, column 8:
    node : !type &12 value

Change History

comment:1 Changed 6 years ago by xi

  • Status changed from new to closed
  • Resolution set to wontfix

PyYAML complains about the tag !type since this is a custom tag and you have not provided a constructor for it so PyYAML doesn't know how to convert this node to a Python object.

Anyway, PyYAML does not provide a default constructor for !!yaml either so this example won't work even if you replace !type with, say, !!str. Here is the list of tags PyYAML supports out-of-box: http://pyyaml.org/wiki/PyYAMLDocumentation#YAMLtagsandPythontypes.

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