Strange issue with invalid YAML

[inoa-jboliveira]

PyYAML 6.0.1

>>> yaml.load('{1:2}', yaml.Loader)
{62: None}
>>> yaml.load('{1: 2}', yaml.Loader)
{1: 2}

The 1st case should throw a parsing error and I don't even know how 62 got in there. Is this an issue with the parser or maybe a difference from rev 1.1 and 1.2 of the standard, which pyyaml does not support?

[perlpunk]

Why should the first be a parsing error?
It's a mapping with one key 1:2, which is a sexagesimal number (base 60), e.g. 1 * 60 + 2 * 1. That's part of yAML 1.1, which PyYAML implements.
The value for the key is empty.
In block style it would be:

---
1:2:

For more info about the differences between YAML 1.1 and 1.2 check https://perlpunk.github.io/yaml-test-schema/schemas.html

If you don't want sexagesimal numbers and you want to process YAML 1.2 files, check out https://pypi.org/project/yamlcore/ which can be used on top of PyYAML.

[inoa-jboliveira]

Thank you for the explanation and the resources. Closing this issue

BTW, I've found this resource https://pyyaml.org/wiki/YAMLColonInFlowContext that makes no mention to base 60 numbers
when testing an yaml parser online which does seem based in pyyaml, but I have no idea who maintains this:
https://yaml-online-parser.appspot.com/

[perlpunk]

I just had a quick look - https://yaml-online-parser.appspot.com/ is apparently using a very old copy of pyyaml (version 3.10):
https://github.com/ptarjan/online-yaml-parser/tree/master/yaml
Your example is something that was fixed in #45

[perlpunk]

I opened an issue regarding the pyyaml version: ptarjan/online-yaml-parser#13