How to apply Kubernetes YAML files from a folder in Python

import os
import yaml
from kubernetes import client, config
from kubernetes.utils import create_from_yaml

def apply_yaml_folder(folder_path):
    """Apply all YAML files in a folder using the Kubernetes mock client."""
    # Load mock configuration
    config.load_kube_config()
    k8s_client = client.ApiClient()

    applied = []
    for filename in sorted(os.listdir(folder_path)):
        if filename.endswith(('.yaml', '.yml')):
            file_path = os.path.join(folder_path, filename)
            try:
                # Apply the YAML file
                create_from_yaml(k8s_client, yaml_file=file_path)
                applied.append(filename)
                print(f"Applied: {filename}")
            except Exception as e:
                print(f"Failed to apply {filename}: {e}")
    return applied

if __name__ == "__main__":
    # Simulate applying YAML files from a folder
    folder = "./manifests"
    os.makedirs(folder, exist_ok=True)

    # Create a sample YAML file
    sample_yaml = """
apiVersion: v1
kind: Pod
metadata:
  name: sample-pod
spec:
  containers:
  - name: nginx
    image: nginx:latest
"""
    with open(os.path.join(folder, "sample.yaml"), "w") as f:
        f.write(sample_yaml)

    # Apply the folder (will fail without a real cluster, demonstrating error handling)
    result = apply_yaml_folder(folder)
    print(f"Files processed: {len(result)}")