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ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order

Reason this release was yanked:

would still install for Python 2

Project description


ruamel.yaml is a YAML 1.2 loader/dumper package for Python.








The 0.16.13 release was the last that will tested to be working on Python 2.7. The 0.17 series will still be tested on Python 3.5, but the 0.18 will not. The 0.17 series will also stop support for the old PyYAML functions, so a `YAML()` instance will need to be created.

The 0.17 series will also see changes in how comments are attached during roundtrip. This will result in backwards incompatibilities on the `.ca` data and it might even be necessary for documented methods that handle comments.

Please adjust your dependencies accordingly if necessary. (`ruamel.yaml<0.17`)

Starting with version 0.15.0 the way YAML files are loaded and dumped is changing. See the API doc for details. Currently existing functionality will throw a warning before being changed/removed. For production systems you should pin the version being used with ``ruamel.yaml<=0.15``. There might be bug fixes in the 0.14 series, but new functionality is likely only to be available via the new API.

If your package uses ruamel.yaml and is not listed on PyPI, drop me an email, preferably with some information on how you use the package (or a link to the repository) and I’ll keep you informed when the status of the API is stable enough to make the transition.


0.17.1 (2021-03-29):
  • added ‘Programming Language :: Python :: 3 :: Only’, and removing 0.17.0 from PyPI (reported by Alasdair Nicol)

0.17.0 (2021-03-26):
  • removed because of incomplete classifiers

  • this release no longer supports Python 2.7, most if not all Python 2 specific code is removed. The 0.17.x series is the last to support Python 3.5 (this also allowed for removal of the dependency on ruamel.std.pathlib)

  • remove Python2 specific code branches and adaptations (u-strings)

  • prepare % code for f-strings using _F

  • allow PyOxidisation (issue 324 resp. issue 171)

  • replaced Python 2 compatible enforcement of keyword arguments with ‘*’

  • the old top level functions load, safe_load, round_trip_load, dump, safe_dump, round_trip_dump, scan, parse, compose, emit, serialize as well as their _all variants for multi-document streams, now issue a PendingDeprecationning (e.g. when run from pytest, but also Python is started with -Wd). Use the methods on YAML(), which have been extended.

  • fix for issue 376: indentation changes could put literal/folded scalar to start before the # column of a following comment. Effectively making the comment part of the scalar in the output. (reported by Bence Nagy)

0.16.13 (2021-03-05):
  • fix for issue 359: could not update() CommentedMap with keyword arguments (reported by Steve Franchak)

  • fix for issue 365: unable to dump mutated TimeStamp objects (reported by Anton Akmerov <>`__)

  • fix for issue 371: unable to addd comment without starting space (reported by ‘Mark Grandi <>`__)

  • fix for issue 373: recursive call to walk_tree not preserving all params (reported by eulores)

  • a None value in a flow-style sequence is now dumped as null instead of !!null ‘’ (reported by mcarans on StackOverlow)

0.16.12 (2020-09-04):
  • update links in doc

0.16.11 (2020-09-03):
0.16.10 (2020-02-12):
  • (auto) updated image references in README to sourceforge

0.16.9 (2020-02-11):
  • update CHANGES

0.16.8 (2020-02-11):
  • update requirements so that ruamel.yaml.clib is installed for 3.8, as it has become available (via manylinux builds)

0.16.7 (2020-01-30):
  • fix typchecking issue on TaggedScalar (reported by Jens Nielsen)

  • fix error in dumping literal scalar in sequence with comments before element (reported by EJ Etherington)

0.16.6 (2020-01-20):
  • fix empty string mapping key roundtripping with preservation of quotes as ? ‘’ (reported via email by Tomer Aharoni).

  • fix incorrect state setting in class constructor (reported by Douglas Raillard)

  • adjust deprecation warning test for Hashable, as that no longer warns (reported by Jason Montleon)

0.16.5 (2019-08-18):
  • allow for YAML(typ=['unsafe', 'pytypes'])

0.16.4 (2019-08-16):
  • fix output of TAG directives with # (reported by Thomas Smith)

0.16.3 (2019-08-15):
  • split construct_object

  • change stuff back to keep mypy happy

  • move setting of version based on YAML directive to scanner, allowing to check for file version during TAG directive scanning

0.16.2 (2019-08-15):
  • preserve YAML and TAG directives on roundtrip, correctly output # in URL for YAML 1.2 (both reported by Thomas Smith)

0.16.1 (2019-08-08):
  • Force the use of new version of ruamel.yaml.clib (reported by Alex Joz)

  • Allow ‘#’ in tag URI as these are allowed in YAML 1.2 (reported by Thomas Smith)

0.16.0 (2019-07-25):
  • split of C source that generates .so file to ruamel.yaml.clib

  • duplicate keys are now an error when working with the old API as well

For older changes see the file CHANGES

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