From 61a19d79669b3ab21c48e0aede16228ec3792f60 Mon Sep 17 00:00:00 2001
From: Aaron Bach <bachya1208@gmail.com>
Date: Wed, 7 Nov 2018 20:35:46 -0700
Subject: [PATCH] Member comments

---
 .../components/sensor/seventeentrack.py       | 26 ++++++++++++-------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/homeassistant/components/sensor/seventeentrack.py b/homeassistant/components/sensor/seventeentrack.py
index 3295f252214..51d7be3d229 100644
--- a/homeassistant/components/sensor/seventeentrack.py
+++ b/homeassistant/components/sensor/seventeentrack.py
@@ -98,6 +98,11 @@ class SeventeenTrackSummarySensor(Entity):
         self._state = initial_state
         self._status = status
 
+    @property
+    def available(self):
+        """Return whether the entity is available."""
+        return bool(self._data.summary.get(self._status))
+
     @property
     def device_state_attributes(self):
         """Return the device state attributes."""
@@ -133,7 +138,7 @@ class SeventeenTrackSummarySensor(Entity):
         """Update the sensor."""
         await self._data.async_update()
 
-        self._state = self._data.summary[self._status]
+        self._state = self._data.summary.get(self._status)
 
 
 class SeventeenTrackPackageSensor(Entity):
@@ -154,6 +159,11 @@ class SeventeenTrackPackageSensor(Entity):
         self._state = package.status
         self._tracking_number = package.tracking_number
 
+    @property
+    def available(self):
+        """Return whether the entity is available."""
+        return bool(self._data.packages.get(self._tracking_number))
+
     @property
     def device_state_attributes(self):
         """Return the device state attributes."""
@@ -185,11 +195,9 @@ class SeventeenTrackPackageSensor(Entity):
         await self._data.async_update()
 
         try:
-            package = next(
-                iter([
-                    p for p in self._data.packages
-                    if p.tracking_number == self._tracking_number
-                ]))
+            package = next((
+                p for p in self._data.packages
+                if p.tracking_number == self._tracking_number))
         except StopIteration:
             # If the package no longer exists in the data, log a message and
             # delete this entity:
@@ -252,8 +260,8 @@ class SeventeenTrackData:
             if not self.show_delivered:
                 packages = [p for p in packages if p.status != VALUE_DELIVERED]
 
-            # Add new packates:
-            to_add = list(set(packages) - set(self.packages))
+            # Add new packages:
+            to_add = set(packages) - set(self.packages)
             if self.packages and to_add:
                 self._async_add_entities([
                     SeventeenTrackPackageSensor(self, package)
@@ -263,7 +271,6 @@ class SeventeenTrackData:
             self.packages = packages
         except SeventeenTrackError as err:
             _LOGGER.error('There was an error retrieving packages: %s', err)
-            self.packages = []
 
         try:
             self.summary = await self._client.profile.summary(
@@ -271,4 +278,3 @@ class SeventeenTrackData:
             _LOGGER.debug('New summary data received: %s', self.summary)
         except SeventeenTrackError as err:
             _LOGGER.error('There was an error retrieving the summary: %s', err)
-            self.summary = {}