In order to represent static Python objects like functions or classes, you need to use a complex !!python/name tag. For compatibility reasons, tags !!python/str and !!python/unicode are still supported and converted to str objects. In Python 3, str objects are converted to !!str scalars and bytes objects to !!binary scalars. a !!python/unicode scalar if its value is ASCII. a !!binary scalar otherwise.Ī unicode object is converted to 1. a !!python/str scalar if its value is a correct utf-8 sequence. !!python/unicode scalars are converted to unicode objects.Ĭonversely, a str object is converted to 1. !!python/str scalars are converted to str objects encoded with utf-8 encoding. !!binary-tagged scalars are converted to str objects with its value decoded using the base64 encoding. !!str-tagged scalars are converted to str objects if its value is ASCII. There are four tags that are converted to str and unicode values: !!str, !!binary, !!python/str, and !!python/unicode.

The following table describes how nodes with different tags are converted to Python objects. PyYAML allows an application to add custom implicit tag resolvers. The scalar value is checked against a set of regular expressions and if one of them matches, the corresponding tag is assigned to the scalar. Plain scalars without explicitly defined tags are subject to implicit tag resolution. The yaml.dump function accepts a Python object and produces a YAML document. To do this, derive it from yaml.YAMLObject (as explained in section Constructors, representers, resolvers) and explicitly set its class property yaml_loader to yaml.SafeLoader. The function yaml.safe_load limits this ability to simple Python objects like integers or lists.Ī python object can be marked as safe and thus be recognized by yaml.safe_load. Note that the ability to construct an arbitrary Python object may be dangerous if you receive a YAML document from an untrusted source such as the Internet. _name_, self.name, self.hp, self.sp) > yaml.load( '''. yaml.dump(data, encoding=('utf-8'|'utf-16-be'|'utf-16-le')) produces a bytes object in the specified encoding.yaml.dump(data) produces the document as a str object.For compatibility reasons, !!python/str and !python/unicode tags are still supported and the corresponding nodes are converted to str objects.bytes objects are converted to !!binary nodes.str objects are converted to !!str nodes.

yaml.dump(data, encoding=None) produces a unicode object.

yaml.dump(data, encoding=('utf-8'|'utf-16-be'|'utf-16-le')) produces a str object in the specified encoding.

yaml.dump(data) produces the document as a UTF-8 encoded str object.

unicode objects are converted into !!python/unicode or !!str nodes depending on whether the object is an ASCII string or not.

str objects are converted into !!str, !!python/str or !binary nodes depending on whether the object is an ASCII, UTF-8 or binary string.

This is a short outline of differences in PyYAML API between Python 2 and Python 3 versions. Starting from the 3.08 release, PyYAML and LibYAML bindings provide a complete support for Python 3. print yaml.dump(yaml.load(document), default_flow_style = False) a: 1 b: c: 3 d: 4 Python 3 support

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