Lint code style and remove PY2 compatibility (#1386)

examples/interactive_asr/vad.py

@@ -35,7 +35,7 @@ def compute_spectral_flatness(frame, epsilon=0.01):
     return -10 * torch.log10(epsilon + geometric_mean / arithmetic_mean)
 
 
-class VoiceActivityDetection(object):
+class VoiceActivityDetection:
     def __init__(
         self,
         num_init_frames=30,
@@ -148,7 +148,7 @@ class VoiceActivityDetection(object):
                 return self.silence_mark
 
 
-class MicrophoneStream(object):
+class MicrophoneStream:
     """Opens a recording stream as a generator yielding the audio chunks."""
 
     def __init__(self, device=None, rate=22050, chunk=2205):

examples/pipeline_wav2letter/languagemodels.py

@@ -8,7 +8,7 @@ class LanguageModel:
         self.char_space = char_space
         self.char_blank = char_blank
 
-        labels = [l for l in labels]
+        labels = list(labels)
         self.length = len(labels)
         enumerated = list(enumerate(labels))
         flipped = [(sub[1], sub[0]) for sub in enumerated]

test/torchaudio_unittest/compliance_kaldi_test.py

@@ -156,7 +156,7 @@ class Test_Kaldi(common_utils.TempDirMixin, common_utils.TorchaudioTestCase):
 
             # Read kaldi's output from file
             kaldi_output_path = os.path.join(self.kaldi_output_dir, f)
-            kaldi_output_dict = {k: v for k, v in torchaudio.kaldi_io.read_mat_ark(kaldi_output_path)}
+            kaldi_output_dict = dict(torchaudio.kaldi_io.read_mat_ark(kaldi_output_path))
 
             assert len(kaldi_output_dict) == 1 and 'my_id' in kaldi_output_dict, 'invalid test kaldi ark file'
             kaldi_output = kaldi_output_dict['my_id']