How to combine YAML files in python?

I got some Kubernetes YAML files which I need to combine.

For that, I tried using Python.

The second file, sample.yaml, should be merged to the first file, source.yaml.

The source.yaml file has one section sample:, where the complete sample.yaml should be added.

I tried using the below code:

#pip install pyyaml
import yaml

def yaml_loader(filepath):
    #Loads a yaml file
    with open(filepath,'r')as file_descriptor:
        data = yaml.load(file_descriptor)
    return data

def yaml_dump(filepath,data):
    with open(filepath,"w") as file_descriptor:
        yaml.dump(data, file_descriptor)


if __name__ == "__main__":
    file_path1 = "source"
    data1 = yaml_loader(file_path1)
    file_path2 = "sample.yaml"

    with open(file_path2, 'r') as file2:
        sample_yaml = file2.read()
    data1['data']['sample'] = sample_yml
    yaml_dump("temp.yml", data1)

This is creating a new file temp.yml but instead of line breaks, it is saving \n as strings:

How to fix this?