class_docstr: Delete a Cloud Spanner instance; if an instance does not exist, no action is taken and the task succeeds.
  
  .. seealso::
      For more information on how to use this operator, take a look at the guide:
      :ref:`howto/operator:SpannerDeleteInstanceOperator`
  
  :param instance_id: The Cloud Spanner instance ID.
  :param project_id: Optional, the ID of the project that owns the Cloud Spanner
      Database.  If set to None or missing, the default project_id from the Google Cloud connection is used.
  :param gcp_conn_id: The connection ID used to connect to Google Cloud.
  :param impersonation_chain: Optional service account to impersonate using short-term
      credentials, or chained list of accounts required to get the access_token
      of the last account in the list, which will be impersonated in the request.
      If set as a string, the account must grant the originating account
      the Service Account Token Creator IAM role.
      If set as a sequence, the identities from the list must grant
      Service Account Token Creator IAM role to the directly preceding identity, with first
      account from the list granting this role to the originating account (templated).
code: def __init__(
      self,
      *,
      instance_id: str,
      project_id: str | None = None,
      gcp_conn_id: str = "google_cloud_default",
      impersonation_chain: str | Sequence[str] | None = None,
      **kwargs,
  ) -> None:
      self.instance_id = instance_id
      self.project_id = project_id
      self.gcp_conn_id = gcp_conn_id
      self._validate_inputs()
      self.impersonation_chain = impersonation_chain
      super().__init__(**kwargs)
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Sequence
  from airflow.exceptions import AirflowException
  from airflow.providers.google.cloud.hooks.spanner import SpannerHook
  from airflow.providers.google.cloud.links.spanner import SpannerDatabaseLink, SpannerInstanceLink
  from airflow.providers.google.cloud.operators.cloud_base import GoogleCloudBaseOperator
label_desc: Use image node_id 1 to create a new SpannerDeleteInstanceOperator object from inherited base classes: GoogleCloudBaseOperator with example: obj = SpannerDeleteInstanceOperator()