yamlordereddictloader

python-yamlordereddictloader

DEPRECATED: the Phynix/yamlloader <https://github.com/Phynix/yamlloader>_ project provide an improved version of this library with unit tests, performance improvements (by providing access to the C implementation of PyYAML) and is more actively developed. You should use it!

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This module provide a loader and a dumper for PyYAML allowing to keep items order when loading a file (by putting them in OrderedDict objects) and to manage OrderedDict objects when dumping to a file.

The loader is based on stackoverflow topic (thanks to Eric Naeseth): http://stackoverflow.com/questions/5121931/in-python-how-can-you-load-yaml-mappings-as-ordereddicts#answer-5121963

Self promotion: I use it a lot with clg <https://clg.readthedocs.io>_, which allows to generate command-line definition from a configuration file, for keeping order of subcommands, options and arguments in the help message!

To install it

.. code-block:: bash

$ pip install yamlordereddictloader

Loader usage

.. code-block:: python

import yaml
import yamlordereddictloader

data = yaml.load(open('myfile.yml'), Loader=yamlordereddictloader.Loader)

Note: For using the safe loader (which want standard YAML tags and does not construct arbitrary Python objects), replace yamlorderdictloader.Loader by yamlorderedictloader.SafeLoader.

Dumper usage

.. code-block:: python

import yaml
import yamlordereddictloader
from collections import OrderedDict

data = OrderedDict([
    ('key1', 'val1'),
    ('key2', OrderedDict([('key21', 'val21'), ('key22', 'val22')]))
])
yaml.dump(
    data,
    open('myfile.yml', 'w'),
    Dumper=yamlordereddictloader.Dumper,
    default_flow_style=False)

Note: For using the safe dumper (which produce standard YAML tags and does not represent arbitrary Python objects), replace yamlorderdictloader.Dumper by yamlorderedictloader.SafeDumper.