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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