node.ext.yaml 2.0.0

Node tree implementation for yaml files

node.ext.yaml provides a node implementation to yaml files.

For more information on nodes see node package.

For more information on plumbing see plumber package.

Usage

Create a yaml file:

from node.ext.yaml import YamlFile

class MyYamlFile(YamlFile):

    @property
    def fs_path(self):
        return '/path/to/file.yaml'

file = MyYamlFile()
file['child'] = 'Value'

# write file to disk
file()

Define factories for child nodes:

from node.ext.yaml import YamlNode

class SpecificChild(YamlNode):
    pass

class DefaultChild(YamlNode):
    pass

class MyYamlFile(YamlFile):
    factories = {
        'child': SpecificChild,
        '*': DefaultChild
    }

Define a schema for node members:

from node import schema
from node.behaviors import SchemaAsAttributes
from plumber import plumbing

@plumbing(SchemaAsAttributes)
class MyYamlFile(YamlFile):
    schema = {
        'int_member': schema.Int(),
        'str_member': schema.Str()
    }

file = MyYamlFile()
file.attr['int_member'] = 1
file.attr['str_member'] = u'String'

Schema members can be defined directly on class.

Note: Be careful not to override existing API members.

from node.behaviors import SchemaProperties

@plumbing(SchemaProperties)
class MyYamlFile(YamlFile):
    int_member = schema.Int()
    str_member = schema.Str()

file = MyYamlFile()
file.int_member = 1
file.str_member = u'String'

Python Versions

• Python 2.7, 3.3+

Contributors

• Robert Niederreiter

Changes

2.0.0 (2026-02-03)

• Refactor package layout to use pyproject.toml and implicit namespace packages. [rnix]

0.4 (2025-10-25)

• Pin upper versions of dependencies. [rnix]

0.3 (2022-12-21)

• node.ext.yaml.behaviors.YamlSequenceStorage implements now __contains__, which compares the storage values directly. This is needed to make containment checks work because yaml child nodes are not cached on __getitem__. [rnix]

• node.ext.yaml.behaviors.YamlMember provides now default_mapping_factory and default_sequence_factory settings. [rnix]

• node.ext.yaml.behaviors.YamlMember inherits from node.behaviors.WildcardFactory now. [rnix]

• Use node.behaviors.SequenceAdopt and node.behaviors.SequenceOrder behaviors on node.ext.yaml.YamlSequence. [rnix]

• Use node.behaviors.MappingOrder behavior in favor of node.behaviors.Order as introduced in node 1.2 on node.ext.yaml.YamlMapping and node.ext.yaml.YamlFile. [rnix]

0.2 (2022-10-06)

• Inherit YamlRootStorage from node.ext.fs.FSLocation, which provides fs_path property. Note that fs_path is handled as list now. [rnix]

• Inherit IYamlRoot from node.ext.fs.interfaces.IFile. [rnix]

• Package depends on node.ext.fs now. [rnix]

• Replace deprecated use of Adopt by MappingAdopt. [rnix]

• node.ext.yaml.YamlNode and node.ext.yaml.YamlFile not provides a default child factory any more. [rnix]

0.1 (2021-11-22)

• Initial work [rnix]

License

Copyright (c) 2021-2025, Node Contributors All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.