code: def delete_file(self, key, shallow=True):
      self.logger.debug("Deleting file at key {}".format(key))
      try:
          if self.auth:
              headers = {
                  "Authorization": "Firebase " + self.auth.get_token()
              }
          else:
              headers = {}
  
          escaped_key = key.replace("/", "%2f")
          url = "{}/o/{}?alt=media".format(
              self.app.storage().storage_bucket, escaped_key
          )
  
          response = self.app.requests.delete(
              url, headers=headers, verify=certifi.old_where()
          )
          if response.status_code != 204:
              raise ValueError(
                  "Response error with code {}, text {}".format(
                      response.status_code, response.text
                  )
              )
  
          self.logger.debug("Done")
      except Exception as err:
          self.logger.warning(
              (
                  "Deleting file {} from studio.storage "
                  + "raised an exception: {}"
              ).format(key, err)
          )
  
imports: import time
  import calendar
  import certifi
  import json
  from studio import pyrebase
  from studio.util import logs
  from studio.auth import get_auth
  from studio.storage.storage_setup import get_storage_verbose_level
  from studio.storage.storage_type import StorageType
  from studio.storage.storage_handler import StorageHandler
label_desc: Use image node_id 4 for calling the FirebaseStorageHandler obj's underlying member method code with example usage: obj.delete_file(key, shallow) without return types