This content originally appeared on Bram.us and was authored by Bramus!
Earlier this week, Haroen Viaene posted this tweet about YAML:
worst part of yaml: https://yaml.org/type/bool.html
— Haroen Viaene (@haroenv) January 10, 2022
The linked-to page contains the documentation on what defines a boolean in YAML, and details that it can be parsed using this regex:
y|Y|yes|Yes|YES|n|N|no|No|NO
|true|True|TRUE|false|False|FALSE
|on|On|ON|off|Off|OFF~
The reason to why this is problematic in some cases, is “The Norway Problem” YAML has: when you abbreviate Norway to its ISO 3116-1 ALPHA-2 form NO, YAML will return false when parsing it:
countries:
- GB
- IE
- FR
- DE
- NO>>> from pyyaml import load
>>> load(the_configuration)
{'countries': ['GB', 'IE', 'FR', 'DE', False]}👉 The solution is to either escape these values in double quotes, or to use a library — such as StrictYAML for Python — that won’t convert NO to False.
~
Other problematic values in YAML are version numbers that end in .0 and a lastname such as Null. By default these get converted to numbers or NULL respectively.
The Norway Problem →
StrictYAML →
This content originally appeared on Bram.us and was authored by Bramus!
Bramus! | Sciencx (2022-01-11T21:14:33+00:00) YAML: The Norway Problem. Retrieved from https://www.scien.cx/2022/01/11/yaml-the-norway-problem/
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