old_contents: from json import dumps, loads
  import logging
  import requests
  
  log = logging.getLogger(__name__)
  logging.basicConfig(level=logging.INFO)
  
  API_URL = "http://stf.auto.ostack.test/api/v1"
  OAUTH_TOKEN = "e1cb89b5108348dd9251b7848948084809dad3a2e1084d8ebc4bf6663381d56e"
  
  devices_path = "/devices"
  user_devices_path = "/user/devices"
  add_device_path = "/user/"
  
  
  def get_available_devices(api_url, oauth_token):
      url = "{0}{1}".format(api_url, devices_path)
      resp = requests.get(
          url,
          headers={
              "Authorization": "Bearer {0}".format(oauth_token)
          }
      )
      device_list = []
      for device in resp.json().get("devices"):
          if device.get("present") and not device.get("owner"):
              device_list.append(device)
      return device_list
  
  
  def add_all_devices(api_url, oauth_token):
      device_list = get_available_devices(api_url, oauth_token)
      url = "{0}{1}".format(api_url, user_devices_path)
      for device in device_list:
          device_serial = device.get("serial")
          resp = requests.post(
              url,
              data=dumps({
                  "serial": "{0}".format(device_serial)
              }).encode("utf-8"),
              headers={
                  "Content-Type": "application/json",
                  "Authorization": "Bearer {0}".format(oauth_token)
              }
          )
          log.info(loads(resp.text).get("description"))
  
  
  def delete_all_devices(api_url, oauth_token):
      serial_list = get_available_devices(api_url, oauth_token)
      url = "{0}{1}".format(api_url, user_devices_path)
      for device_serial in serial_list:
          resp = requests.post(
              url,
              data=dumps({
                  "serial": "{0}".format(device_serial)
              }).encode("utf-8"),
              headers={
                  "Content-Type": "application/json",
                  "Authorization": "Bearer {0}".format(oauth_token)
              }
          )
          log.info(loads(resp.text).get("description"))
  
  add_all_devices(API_URL, OAUTH_TOKEN)
new_contents: from json import dumps, loads
  import logging
  import requests
  
  log = logging.getLogger(__name__)
  logging.basicConfig(level=logging.INFO)
  
  API_URL = "http://stf.auto.ostack.test/api/v1"
  OAUTH_TOKEN = "e1cb89b5108348dd9251b7848948084809dad3a2e1084d8ebc4bf6663381d56e"
  
  devices_path = "/devices"
  user_devices_path = "/user/devices"
  add_device_path = "/user/"
  
  
  def get_available_devices(api_url, oauth_token):
      url = "{0}{1}".format(api_url, devices_path)
      resp = requests.get(
          url,
          headers={
              "Authorization": "Bearer {0}".format(oauth_token)
          }
      )
      device_list = []
      for device in resp.json().get("devices"):
          if device.get("present") and not device.get("owner"):
              device_list.append(device)
      return device_list
  
  
  def get_owned_devices(api_url, oauth_token):
      url = "{0}{1}".format(api_url, user_devices_path)
      resp = requests.get(
          url,
          headers={
              "Authorization": "Bearer {0}".format(oauth_token)
          }
      )
      return resp.json().get("devices")
  
  
  def add_all_devices(api_url, oauth_token):
      device_list = get_available_devices(api_url, oauth_token)
      url = "{0}{1}".format(api_url, user_devices_path)
      for device in device_list:
          device_serial = device.get("serial")
          resp = requests.post(
              url,
              data=dumps({
                  "serial": "{0}".format(device_serial)
              }).encode("utf-8"),
              headers={
                  "Content-Type": "application/json",
                  "Authorization": "Bearer {0}".format(oauth_token)
              }
          )
          log.info(loads(resp.text).get("description"))
  
  
  def delete_all_devices(api_url, oauth_token):
      device_list = get_owned_devices(api_url, oauth_token)
      for device in device_list:
          device_serial = device.get("serial")
          url = "{0}{1}/{2}".format(api_url, user_devices_path, device_serial)
          resp = requests.delete(
              url,
              headers={
                  "Content-Type": "application/json",
                  "Authorization": "Bearer {0}".format(oauth_token)
              }
          )
          log.info(loads(resp.text).get("description"))
  
  add_all_devices(API_URL, OAUTH_TOKEN)
  delete_all_devices(API_URL, OAUTH_TOKEN)
subject: add delete method