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For a complete changelog, see:
* https://github.com/yaml/pyyaml/commits/
* https://bitbucket.org/xi/pyyaml/commits/
5.1 (2019-03-13)
----------------
* https://github.com/yaml/pyyaml/pull/35 -- Some modernization of the test running
* https://github.com/yaml/pyyaml/pull/42 -- Install tox in a virtualenv
* https://github.com/yaml/pyyaml/pull/45 -- Allow colon in a plain scalar in a flow context
* https://github.com/yaml/pyyaml/pull/48 -- Fix typos
* https://github.com/yaml/pyyaml/pull/55 -- Improve RepresenterError creation
* https://github.com/yaml/pyyaml/pull/59 -- Resolves #57, update readme issues link
* https://github.com/yaml/pyyaml/pull/60 -- Document and test Python 3.6 support
* https://github.com/yaml/pyyaml/pull/61 -- Use Travis CI built in pip cache support
* https://github.com/yaml/pyyaml/pull/62 -- Remove tox workaround for Travis CI
* https://github.com/yaml/pyyaml/pull/63 -- Adding support to Unicode characters over codepoint 0xffff
* https://github.com/yaml/pyyaml/pull/75 -- add 3.12 changelog
* https://github.com/yaml/pyyaml/pull/76 -- Fallback to Pure Python if Compilation fails
* https://github.com/yaml/pyyaml/pull/84 -- Drop unsupported Python 3.3
* https://github.com/yaml/pyyaml/pull/102 -- Include license file in the generated wheel package
* https://github.com/yaml/pyyaml/pull/105 -- Removed Python 2.6 & 3.3 support
* https://github.com/yaml/pyyaml/pull/111 -- Remove commented out Psyco code
* https://github.com/yaml/pyyaml/pull/129 -- Remove call to `ord` in lib3 emitter code
* https://github.com/yaml/pyyaml/pull/149 -- Test on Python 3.7-dev
* https://github.com/yaml/pyyaml/pull/158 -- Support escaped slash in double quotes "\/"
* https://github.com/yaml/pyyaml/pull/175 -- Updated link to pypi in release announcement
* https://github.com/yaml/pyyaml/pull/181 -- Import Hashable from collections.abc
* https://github.com/yaml/pyyaml/pull/194 -- Reverting https://github.com/yaml/pyyaml/pull/74
* https://github.com/yaml/pyyaml/pull/195 -- Build libyaml on travis
* https://github.com/yaml/pyyaml/pull/196 -- Force cython when building sdist
* https://github.com/yaml/pyyaml/pull/254 -- Allow to turn off sorting keys in Dumper (2)
* https://github.com/yaml/pyyaml/pull/256 -- Make default_flow_style=False
* https://github.com/yaml/pyyaml/pull/257 -- Deprecate yaml.load and add FullLoader and UnsafeLoader classes
* https://github.com/yaml/pyyaml/pull/261 -- Skip certain unicode tests when maxunicode not > 0xffff
* https://github.com/yaml/pyyaml/pull/263 -- Windows Appveyor build
3.13 (2018-07-05)
-----------------
* Resolved issues around PyYAML working in Python 3.7.
3.12 (2016-08-28)
-----------------
* Wheel packages for Windows binaries.
* Adding an implicit resolver to a derived loader should not affect the base loader.
* Uniform representation for OrderedDict? across different versions of Python.
* Fixed comparison to None warning.
3.11 (2014-03-26)
-----------------
* Source and binary distributions are rebuilt against the latest
versions of Cython and LibYAML.
3.10 (2011-05-30)
-----------------
* Do not try to build LibYAML bindings on platforms other than CPython
(Thank to olt(at)bogosoft(dot)com).
* Clear cyclic references in the parser and the emitter
(Thank to kristjan(at)ccpgames(dot)com).
* Dropped support for Python 2.3 and 2.4.
3.09 (2009-08-31)
-----------------
* Fixed an obscure scanner error not reported when there is
no line break at the end of the stream (Thank to Ingy).
* Fixed use of uninitialized memory when emitting anchors with
LibYAML bindings (Thank to cegner(at)yahoo-inc(dot)com).
* Fixed emitting incorrect BOM characters for UTF-16 (Thank to
Valentin Nechayev)
* Fixed the emitter for folded scalars not respecting the preferred
line width (Thank to Ingy).
* Fixed a subtle ordering issue with emitting '%TAG' directives
(Thank to Andrey Somov).
* Fixed performance regression with LibYAML bindings.
3.08 (2008-12-31)
-----------------
* Python 3 support (Thank to Erick Tryzelaar).
* Use Cython instead of Pyrex to build LibYAML bindings.
* Refactored support for unicode and byte input/output streams.
3.07 (2008-12-29)
-----------------
* The emitter learned to use an optional indentation indicator
for block scalar; thus scalars with leading whitespaces
could now be represented in a literal or folded style.
* The test suite is now included in the source distribution.
To run the tests, type 'python setup.py test'.
* Refactored the test suite: dropped unittest in favor of
a custom test appliance.
* Fixed the path resolver in CDumper.
* Forced an explicit document end indicator when there is
a possibility of parsing ambiguity.
* More setup.py improvements: the package should be usable
when any combination of setuptools, Pyrex and LibYAML
is installed.
* Windows binary packages are built against LibYAML-0.1.2.
* Minor typos and corrections (Thank to Ingy dot Net
and Andrey Somov).
3.06 (2008-10-03)
-----------------
* setup.py checks whether LibYAML is installed and if so, builds
and installs LibYAML bindings. To force or disable installation
of LibYAML bindings, use '--with-libyaml' or '--without-libyaml'
respectively.
* The source distribution includes compiled Pyrex sources so
building LibYAML bindings no longer requires Pyrex installed.
* 'yaml.load()' raises an exception if the input stream contains
more than one YAML document.
* Fixed exceptions produced by LibYAML bindings.
* Fixed a dot '.' character being recognized as !!float.
* Fixed Python 2.3 compatibility issue in constructing !!timestamp values.
* Windows binary packages are built against the LibYAML stable branch.
* Added attributes 'yaml.__version__' and 'yaml.__with_libyaml__'.
3.05 (2007-05-13)
-----------------
* Windows binary packages were built with LibYAML trunk.
* Fixed a bug that prevent processing a live stream of YAML documents in
timely manner (Thanks edward(at)sweetbytes(dot)net).
* Fixed a bug when the path in add_path_resolver contains boolean values
(Thanks jstroud(at)mbi(dot)ucla(dot)edu).
* Fixed loss of microsecond precision in timestamps
(Thanks edemaine(at)mit(dot)edu).
* Fixed loading an empty YAML stream.
* Allowed immutable subclasses of YAMLObject.
* Made the encoding of the unicode->str conversion explicit so that
the conversion does not depend on the default Python encoding.
* Forced emitting float values in a YAML compatible form.
3.04 (2006-08-20)
-----------------
* Include experimental LibYAML bindings.
* Fully support recursive structures.
* Sort dictionary keys. Mapping node values are now represented
as lists of pairs instead of dictionaries. No longer check
for duplicate mapping keys as it didn't work correctly anyway.
* Fix invalid output of single-quoted scalars in cases when a single
quote is not escaped when preceded by whitespaces or line breaks.
* To make porting easier, rewrite Parser not using generators.
* Fix handling of unexpected block mapping values.
* Fix a bug in Representer.represent_object: copy_reg.dispatch_table
was not correctly handled.
* Fix a bug when a block scalar is incorrectly emitted in the simple
key context.
* Hold references to the objects being represented.
* Make Representer not try to guess !!pairs when a list is represented.
* Fix timestamp constructing and representing.
* Fix the 'N' plain scalar being incorrectly recognized as !!bool.
3.03 (2006-06-19)
-----------------
* Fix Python 2.5 compatibility issues.
* Fix numerous bugs in the float handling.
* Fix scanning some ill-formed documents.
* Other minor fixes.
3.02 (2006-05-15)
-----------------
* Fix win32 installer. Apparently bdist_wininst does not work well
under Linux.
* Fix a bug in add_path_resolver.
* Add the yaml-highlight example. Try to run on a color terminal:
`python yaml_hl.py <any_document.yaml`.
3.01 (2006-05-07)
-----------------
* Initial release. The version number reflects the codename
of the project (PyYAML 3000) and differentiates it from
the abandoned PyYaml module.