code: def list_studies(self):
      url = "{}/suggestion/v1/studies".format(self.endpoint)
      response = requests.get(url)
      studies = []
  
      if response.ok:
          dicts = response.json()["data"]
          for dict in dicts:
              study = Study.from_dict(dict)
              studies.append(study)
  
      return studies
  
imports: import os
  import json
  import requests
  from .model import Study
  from .model import Trial
  from .model import TrialMetric
label_desc: Use image node_id 4 for calling the AdvisorClient obj's underlying member method code with example usage: obj.list_studies() and returns: studies