7.7YAML Parsing

YAML is common in configuration files, CI/CD pipelines, and test data.

import yaml

# Load test configuration
with open("config.yaml") as f:
    config = yaml.safe_load(f)
    base_url = config["environments"]["staging"]["url"]
    timeout = config["environments"]["staging"]["timeout"]

# Load test data from YAML
with open("test_users.yaml") as f:
    test_data = yaml.safe_load(f)
    # test_users.yaml:
    # users:
    #   - email: admin@test.com
    #     role: admin
    #   - email: viewer@test.com
    #     role: viewer

Always use yaml.safe_load(), not yaml.load(). The latter can execute arbitrary code.