__init__.py 文件源码

def ordered_load(
        stream, Loader=yaml.SafeLoader, object_pairs_hook=OrderedDict):
    """Load yaml as an ordered dict

    This allows us to inspect the order of the file on disk to make
    sure it was correct by our rules.
    """
    class OrderedLoader(Loader):
        pass

    def construct_mapping(loader, node):
        loader.flatten_mapping(node)
        return object_pairs_hook(loader.construct_pairs(node))

    OrderedLoader.add_constructor(
        yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG,
        construct_mapping)
    # for parameters.yaml we treat numbers (especially version
    # numbers) as strings. So that microversion specification of 2.20
    # and 2.2 don't get confused.
    OrderedLoader.add_constructor(
        u'tag:yaml.org,2002:float',
        yaml.constructor.SafeConstructor.construct_yaml_str)

    return yaml.load(stream, OrderedLoader)