import os
from gcore import Gcore

client = Gcore(
    api_key=os.environ.get("GCORE_API_KEY"),  # This is the default and can be omitted
)
k8s_cluster_version_list = client.cloud.k8s.clusters.list_versions_for_upgrade(
    cluster_name="cluster_name",
    project_id=0,
    region_id=0,
)
print(k8s_cluster_version_list.count)

{
  "count": 1,
  "results": [
    {
      "version": "<string>"
    }
  ]
}