old_contents: """Support for One-Time Password (OTP)."""
  import time
  import logging
  
  import voluptuous as vol
  
  from homeassistant.core import callback
  import homeassistant.helpers.config_validation as cv
  from homeassistant.components.sensor import PLATFORM_SCHEMA
  from homeassistant.const import CONF_NAME, CONF_TOKEN
  from homeassistant.helpers.entity import Entity
  
  _LOGGER = logging.getLogger(__name__)
  
  DEFAULT_NAME = "OTP Sensor"
  
  TIME_STEP = 30  # Default time step assumed by Google Authenticator
  
  ICON = "mdi:update"
  
  PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
      {
          vol.Required(CONF_TOKEN): cv.string,
          vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
      }
  )
  
  
  async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
      """Set up the OTP sensor."""
      name = config.get(CONF_NAME)
      token = config.get(CONF_TOKEN)
  
      async_add_entities([TOTPSensor(name, token)], True)
      return True
  
  
  # Only TOTP supported at the moment, HOTP might be added later
  class TOTPSensor(Entity):
      """Representation of a TOTP sensor."""
  
      def __init__(self, name, token):
          """Initialize the sensor."""
          import pyotp
  
          self._name = name
          self._otp = pyotp.TOTP(token)
          self._state = None
          self._next_expiration = None
  
      async def async_added_to_hass(self):
          """Handle when an entity is about to be added to Home Assistant."""
          self._call_loop()
  
      @callback
      def _call_loop(self):
          self._state = self._otp.now()
          self.async_schedule_update_ha_state()
  
          # Update must occur at even TIME_STEP, e.g. 12:00:00, 12:00:30,
          # 12:01:00, etc. in order to have synced time (see RFC6238)
          self._next_expiration = TIME_STEP - (time.time() % TIME_STEP)
          self.hass.loop.call_later(self._next_expiration, self._call_loop)
  
      @property
      def name(self):
          """Return the name of the sensor."""
          return self._name
  
      @property
      def state(self):
          """Return the state of the sensor."""
          return self._state
  
      @property
      def should_poll(self):
          """No polling needed."""
          return False
  
      @property
      def icon(self):
          """Return the icon to use in the frontend."""
          return ICON
  
new_contents: """Support for One-Time Password (OTP)."""
  import logging
  import time
  
  import pyotp
  import voluptuous as vol
  
  from homeassistant.components.sensor import PLATFORM_SCHEMA
  from homeassistant.const import CONF_NAME, CONF_TOKEN
  from homeassistant.core import callback
  import homeassistant.helpers.config_validation as cv
  from homeassistant.helpers.entity import Entity
  
  _LOGGER = logging.getLogger(__name__)
  
  DEFAULT_NAME = "OTP Sensor"
  
  TIME_STEP = 30  # Default time step assumed by Google Authenticator
  
  ICON = "mdi:update"
  
  PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
      {
          vol.Required(CONF_TOKEN): cv.string,
          vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
      }
  )
  
  
  async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
      """Set up the OTP sensor."""
      name = config.get(CONF_NAME)
      token = config.get(CONF_TOKEN)
  
      async_add_entities([TOTPSensor(name, token)], True)
      return True
  
  
  # Only TOTP supported at the moment, HOTP might be added later
  class TOTPSensor(Entity):
      """Representation of a TOTP sensor."""
  
      def __init__(self, name, token):
          """Initialize the sensor."""
          self._name = name
          self._otp = pyotp.TOTP(token)
          self._state = None
          self._next_expiration = None
  
      async def async_added_to_hass(self):
          """Handle when an entity is about to be added to Home Assistant."""
          self._call_loop()
  
      @callback
      def _call_loop(self):
          self._state = self._otp.now()
          self.async_schedule_update_ha_state()
  
          # Update must occur at even TIME_STEP, e.g. 12:00:00, 12:00:30,
          # 12:01:00, etc. in order to have synced time (see RFC6238)
          self._next_expiration = TIME_STEP - (time.time() % TIME_STEP)
          self.hass.loop.call_later(self._next_expiration, self._call_loop)
  
      @property
      def name(self):
          """Return the name of the sensor."""
          return self._name
  
      @property
      def state(self):
          """Return the state of the sensor."""
          return self._state
  
      @property
      def should_poll(self):
          """No polling needed."""
          return False
  
      @property
      def icon(self):
          """Return the icon to use in the frontend."""
          return ICON
  
subject: Move imports in otp component (#28044)