Changes

• #327 -- Change README format to Markdown
• #483 -- Add a test for YAML 1.1 types
• #497 -- fix float resolver to ignore . and ._
• #550 -- drop Python 2.7
• #553 -- Fix spelling of “hexadecimal”
• #556 -- fix representation of Enum subclasses
• #557 -- fix libyaml extension compiler warnings
• #560 -- fix ResourceWarning on leaked file descriptors
• #561 -- always require Loader arg to yaml.load()
• #564 -- remove remaining direct distutils usage

• Repair incompatibilities introduced with 5.1. The default Loader was changed, but several methods like add_constructor still used the old default https://github.com/yaml/pyyaml/pull/279 -- A more flexible fix for custom tag constructors https://github.com/yaml/pyyaml/pull/287 -- Change default loader for yaml.add_constructor https://github.com/yaml/pyyaml/pull/305 -- Change default loader for add_implicit_resolver, add_path_resolver
• Make FullLoader safer by removing python/object/apply from the default FullLoader https://github.com/yaml/pyyaml/pull/347 -- Move constructor for object/apply to UnsafeConstructor
• Fix bug introduced in 5.1 where quoting went wrong on systems with sys.maxunicode <= 0xffff https://github.com/yaml/pyyaml/pull/276 -- Fix logic for quoting special characters
• Other PRs: https://github.com/yaml/pyyaml/pull/280 -- Update CHANGES for 5.1

• Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b2+

• Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b1

• 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

• Resolved issues around PyYAML working in Python 3.7.

• 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.

• Source and binary distributions are rebuilt against the latest versions of Cython and LibYAML.

• 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.

• 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.

• 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.

• 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).

• 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'.

• 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.

• 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.

• Fix Python 2.5 compatibility issues.
• Fix numerous bugs in the float handling.
• Fix scanning some ill-formed documents.
• Other minor fixes.

• 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.

• Initial release. The version number reflects the codename of the project (PyYAML 3000) and differentiates it from the abandoned PyYaml module.