How to save python yaml and load a nested class?

Question:

Solution:

Instead of using ‘pyyaml,’ use 'ruamel.yaml'. 'pyyaml' might not able to handle nested objects as it has a few limitations.

Pip Install:

pip install ruamel.yaml

Code

# hello.py import pydantic as dan class Hello: @dan.dataclasses.dataclass class Data: data_a: int from ruamel import yaml data = Hello.Data(1) filename = "hi.yaml" with open(filename, "w") as fh: yaml.dump(data, fh) with open(filename, "r") as fh: yaml.load(fh, yaml.Loader) # Causes the error.

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