Change some conditions to be more pythonic

src/aiy/_drivers/_button.py

@@ -82,7 +82,7 @@ def MyButtonPressHandler(channel):
           my_button.on_press(MyButtonPressHandler)
         """
         GPIO.remove_event_detect(self.channel)
-        if callback is not None:
+        if callback:
             self.callback = callback
             GPIO.add_event_detect(
                 self.channel, self.polarity, callback=self._debounce_and_callback)

src/aiy/_drivers/_led.py

@@ -90,7 +90,7 @@ def _animate(self):
                 running = self.running
             if not running:
                 return
-            if state is not None:
+            if state:
                 if not self._parse_state(state):
                     raise ValueError('unsupported state: %d' % state)
             if self.iterator:

src/aiy/assistant/auth_helpers.py

@@ -122,6 +122,6 @@ def _try_to_get_credentials(client_secrets):
 
 
 def get_assistant_credentials(credentials_file=None):
-    if credentials_file is None:
+    if not credentials_file:
         credentials_file = _ASSISTANT_CREDENTIALS_FILE
     return _try_to_get_credentials(credentials_file)

src/aiy/assistant/grpc.py

@@ -71,7 +71,7 @@ def get_assistant():
                 aiy.audio.play_audio(audio)
     """
     global _assistant_recognizer
-    if _assistant_recognizer is None:
+    if not _assistant_recognizer:
         credentials = aiy.assistant.auth_helpers.get_assistant_credentials()
         _assistant_recognizer = _AssistantRecognizer(credentials)
     return _assistant_recognizer

src/aiy/audio.py

@@ -66,7 +66,7 @@ def get_player():
     audio.
     """
     global _voicehat_player
-    if _voicehat_player is None:
+    if not _voicehat_player:
         _voicehat_player = aiy._drivers._player.Player()
     return _voicehat_player
 
@@ -78,7 +78,7 @@ def get_recorder():
     use this.
     """
     global _voicehat_recorder
-    if _voicehat_recorder is None:
+    if not _voicehat_recorder:
         _voicehat_recorder = aiy._drivers._recorder.Recorder()
     return _voicehat_recorder
 
@@ -126,6 +126,6 @@ def get_status_ui():
     of statuses it is able to communicate with the LED on the Voicehat.
     """
     global _status_ui
-    if _status_ui is None:
+    if not _status_ui:
         _status_ui = aiy._drivers._StatusUi()
     return _status_ui

src/aiy/cloudspeech.py

@@ -79,6 +79,6 @@ def get_recognizer():
                 turn_off_light()
     """
     global _cloudspeech_recognizer
-    if _cloudspeech_recognizer is None:
+    if not _cloudspeech_recognizer:
         _cloudspeech_recognizer = _CloudSpeechRecognizer(CLOUDSPEECH_CREDENTIALS_FILE)
     return _cloudspeech_recognizer

src/aiy/voicehat.py

@@ -58,7 +58,7 @@ def on_button_press(_):
         # Calling wait_for_press() also cancels any callback.
     """
     global _voicehat_button
-    if _voicehat_button is None:
+    if not _voicehat_button:
         _voicehat_button = aiy._drivers._button.Button(channel=_GPIO_BUTTON)
     return _voicehat_button
 
@@ -76,7 +76,7 @@ def get_led():
     led.set_state(aiy.voicehat.LED_OFF)
     """
     global _voicehat_led
-    if _voicehat_led is None:
+    if not _voicehat_led:
         _voicehat_led = aiy._drivers._led.LED(channel=_GPIO_LED)
         _voicehat_led.start()
     return _voicehat_led
@@ -104,6 +104,6 @@ def get_status_ui():
     aiy.voicehat.get_status_ui().set_state('thinking')
     """
     global _status_ui
-    if _status_ui is None:
+    if not _status_ui:
         _status_ui = aiy._drivers._status_ui._StatusUi()
     return _status_ui

src/assistant_grpc_demo.py

@@ -40,13 +40,13 @@ def main():
             status_ui.status('listening')
             print('Listening...')
             text, audio = assistant.recognize()
-            if text is not None:
+            if text:
                 if text == 'goodbye':
                     status_ui.status('stopping')
                     print('Bye!')
                     break
                 print('You said "', text, '"')
-            if audio is not None:
+            if audio:
                 aiy.audio.play_audio(audio)
 
 

src/cloudspeech_demo.py

@@ -35,7 +35,7 @@ def main():
         button.wait_for_press()
         print('Listening...')
         text = recognizer.recognize()
-        if text is None:
+        if not text:
             print('Sorry, I did not hear you.')
         else:
             print('You said "', text, '"')