pyyaml
confuse
Our great sponsors
| pyyaml | confuse | |
|---|---|---|
| 16 | 2 | |
| 2,425 | 410 | |
| 1.3% | 0.2% | |
| 3.9 | 5.0 | |
| 11 days ago | 5 months ago | |
| Python | Python | |
| MIT License | MIT License |
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pyyaml
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Cython 3.0 Released
PyYAML knew about the breakage since january 2022[0], and nothing really happened. After a year and a half with lots of alphas and betas, I don't think there is much cython could do, short of fixing PyYAML themselves.
[0]: https://github.com/yaml/pyyaml/issues/601
- Cython v3 release breaking PyYAML install well used in Python ecosystem
- Cython and pyyaml is breaking many builds
- I'm needing a hand, I do not understand some (seemingly) simple Python stuff.
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is there any difference between using string.format() or an fstring?
They did finally change the default, in PyYAML 6, after many many bugs pointing out that their previous approach is broken (including one by yours truly), so the default is now safe.
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Using Rust to not have to touch Yaml in k8s land
Note some parsers, most notably pyyaml are still at yaml 1.1, because 13 years is just not enough time to update it.
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JSON is not a YAML subset
That part of the YAML 1.2 spec is in conflict with reality, though. The base of YAML 1.1 documents is large enough that a backwards-incompatible change to default behavior is for practical purposes impossible.
YAML 1.1 was released in 2005, and 1.2 in 2009 -- only four years later. But here we are, in 2022, and YAML 1.1 is still the default (in many cases, only) version supported. That's why the "Norway problem" persists -- it's not possible for the parser to know whether an un-versioned YAML document containing "a: no" should parse the same as {"a": false} or {"a": "no"}.
Python (PyYAML) doesn't support 1.2 yet: https://github.com/yaml/pyyaml/issues/116
Ruby (Psych) ditto -- I can't even find a tracking issue to enable it.
Go (go-yaml) is a mixture of YAML 1.1 and 1.2, depending on the author's preferences.
Also, as a rough guideline, you can't have a backwards-incompatible revision of a versioned spec declare that it's the new default version, because that breaks all existing users.
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I accidentally used YAML.parse instead of JSON.parse, and it worked?
Many parsers either default to YAML pre-1.2 or do not even expose a YAML 1.2 option. PyYAML has no 1.2 option, for example. So unless Ansible is using something other than PyYAML...
Relevant (open) PR: https://github.com/yaml/pyyaml/pull/555
- AttributeError: '_io.TextIOWrapper' object has no attribute 'items'
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Why doesn't yaml allow safe_dump for decimals?
Are you perhaps talking about decimal.Decimal? https://github.com/yaml/pyyaml/issues/255
confuse
- Yaml config parser package is named "confuse"
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Stop hardcoding and start using config files instead, it takes very little effort with configparser
I have been using confuse here and there for simple projects. It was a configuration tool that spun off from a small team making a Python music library manager. Both confuse and dynaconf allow default key configuration, layers of configs that can override others, etc. But with confuse I eventually found my use-case to diverge from the one that the music-manager-app devs had in mind.
What are some alternatives?
strictyaml - Type-safe YAML parser and validator.
dynaconf - Configuration Management for Python ⚙
yamllint - A linter for YAML files.
jsonnet - Jsonnet - The data templating language
tmuxp - 🖥️ Session manager for tmux, build on libtmux.
marshmallow - A lightweight library for converting complex objects to and from simple Python datatypes.
parse_it - A python library for parsing multiple types of config files, envvars & command line arguments that takes the headache out of setting app configurations.
python-strict-yaml-parsing - Examples of strict yaml parsing in python
xdgconfig - Easy access to ~/.config from python
python-frontmatter - Parse and manage posts with YAML (or other) frontmatter
cmdkit - A library for developing command-line applications in Python.