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_certificate = client.cloud.k8s.clusters.get_certificate(
    cluster_name="cluster_name",
    project_id=0,
    region_id=0,
)
print(k8s_cluster_certificate.certificate)

{
  "certificate": "<string>",
  "key": "<string>"
}