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How to Validate Yaml from the Command Line Using Python

howchoo   (467)
August 23, 2023
2 minutes


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python • 18 guides

This guide will show you how to validate yaml on the command line using Python.

1 – Use the yaml module to check for valid yaml

python -c 'import yaml, sys; yaml.safe_load(sys.stdin)' < cfg.yaml

If your file contains valid yaml, it will do nothing.

[tmp]$ python -c 'import yaml, sys; yaml.safe_load(sys.stdin)' < cfg.yaml

2 – Debugging invalid yaml

If the file does not contain valid yaml, you’ll get a traceback. From that traceback you should be able to identify the problem.

[tmp]$ python -c 'import yaml, sys; yaml.safe_load(sys.stdin)' < cfg.yaml
Traceback (most recent call last):
  File "<string>", line 1, in <module>
could not find expected ':'
  in "<stdin>", line 5, column 1

The traceback contains a lot of lines that are very useful, but near the end you’ll find the line number and column of the error.


Class Vs. Instance Variables in Python 3

howchoo   (467)
November 22, 2023

When learning object oriented programming in Python, there can be a few gotchas when it comes to distinguishing between class and instance variables. In this guide I’ll explain the difference between class and instance variables and provide examples demonstrating various use cases. 1 – Class vs. instance variables First, a quick review if you’re new

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