The loader transforms 'on' key to True

[adelbke]

I'm trying to parse a github Actions yaml file that has a key named 'on' like shown below:

candidate.yaml

name: action code

on: # this is the key causing the issue, it's translated to 'True' when loaded by pyyaml
  push:
    branches:
      - master

jobs:
  build:

    runs-on: ubuntu-16.04

    steps:
# Action Steps

tested on:
Python version: 3.8.6
Ubuntu 20.10

here's the code used:

import yaml
# candidate.yaml is the name of the file up above
data = yaml.load(open('candidate.yaml','r'))
print(yaml.dump(data))

here's the output:

name: action code)
true: # here it says 'true' instead of 'on' in the original file
  push:
    branches:
    - master
jobs:
  build:
    runs-on: ubuntu-16.04
    steps: null

as you can see the 'on' key has been replaced by 'True' on this file

[nitzmahone]

This is the expected behavior from a YAML 1.1 compliant library (which pyyaml is). You can modify this behavior by replacing the boolean implicit resolver with one that excludes on and off in a custom loader (or by modifying the existing loaders).