Added get_all_data and linted

Author: makermelissa

adafruit_io/adafruit_io.py

@@ -70,10 +70,10 @@ def __init__(self, mqtt_client):
         # MiniMQTT's username kwarg is optional, IO requires a username
         try:
             self._user = self._client.user
-        except:
+        except Exception as err:
             raise TypeError(
                 "Adafruit IO requires a username, please set one in MiniMQTT"
-            )
+            ) from err
         # User-defined MQTT callback methods must be init'd to None
         self.on_connect = None
         self.on_disconnect = None
@@ -105,17 +105,17 @@ def reconnect(self):
         """
         try:
             self._client.reconnect()
-        except:
-            raise AdafruitIO_MQTTError("Unable to reconnect to Adafruit IO.")
+        except Exception as err:
+            raise AdafruitIO_MQTTError("Unable to reconnect to Adafruit IO.") from err
 
     def connect(self):
         """Connects to the Adafruit IO MQTT Broker.
         Must be called before any other API methods are called.
         """
         try:
             self._client.connect()
-        except:
-            raise AdafruitIO_MQTTError("Unable to connect to Adafruit IO.")
+        except Exception as err:
+            raise AdafruitIO_MQTTError("Unable to connect to Adafruit IO.") from err
 
     def disconnect(self):
         """Disconnects from Adafruit IO MQTT Broker.
@@ -556,11 +556,22 @@ def send_data(self, feed_key, data, metadata=None, precision=None):
         if precision:
             try:
                 data = round(data, precision)
-            except NotImplementedError:  # received a non-float value
-                raise NotImplementedError("Precision requires a floating point value")
+            except NotImplementedError as err:  # received a non-float value
+                raise NotImplementedError(
+                    "Precision requires a floating point value"
+                ) from err
         payload = self._create_data(data, metadata)
         self._post(path, payload)
 
+    def receive_all_data(self, feed_key):
+        """
+        Get all data values from a specified Adafruit IO feed. Data is
+        returned in reverse order.
+        :param str feed_key: Adafruit IO feed key
+        """
+        path = self._compose_path("feeds/{0}/data".format(feed_key))
+        return self._get(path)
+
     def receive_data(self, feed_key):
         """
         Return the most recent value for the specified feed.

adafruit_io/adafruit_io_errors.py

@@ -31,7 +31,7 @@ class AdafruitIO_ThrottleError(Exception):
     """Adafruit IO request error class for rate-limiting"""
 
     def __init__(self):
-        super(AdafruitIO_ThrottleError, self).__init__(
+        super().__init__(
             "Number of Adafruit IO Requests exceeded! \
                                                             Please try again in 30 seconds.."
         )
@@ -43,7 +43,7 @@ class AdafruitIO_RequestError(Exception):
     def __init__(self, response):
         response_content = response.json()
         error = response_content["error"]
-        super(AdafruitIO_RequestError, self).__init__(
+        super().__init__(
             "Adafruit IO Error {0}: {1}".format(response.status_code, error)
         )
 
@@ -52,4 +52,4 @@ class AdafruitIO_MQTTError(Exception):
     """Adafruit IO MQTT error class"""
 
     def __init__(self, response):
-        super(AdafruitIO_MQTTError, self).__init__("MQTT Error: {0}".format(response))
+        super().__init__("MQTT Error: {0}".format(response))