diff --git a/python/config.py b/python/config.py
index 9b57374..90c3247 100644
--- a/python/config.py
+++ b/python/config.py
@@ -65,4 +65,4 @@ N_ROLLING_HISTORY = 2
 """Number of past audio frames to include in the rolling window"""
 
 MIN_VOLUME_THRESHOLD = 1e-7
-"""No music visualization displayed if recorded audio volume below threshold"""
\ No newline at end of file
+"""No music visualization displayed if recorded audio volume below threshold"""
diff --git a/python/gui.py b/python/gui.py
index ef98704..d71ee7a 100644
--- a/python/gui.py
+++ b/python/gui.py
@@ -27,7 +27,6 @@ class GUI:
 if __name__ == '__main__':
     N = 48
     gui = GUI(title='Test')
-    
     # Sin plot
     gui.add_plot(title='Sin Plot')
     gui.add_curve(plot_index=0)
@@ -38,9 +37,8 @@ if __name__ == '__main__':
 
     while True:
         t = time.time()
-        x = np.linspace(t, 2 * np.pi + t, N);
+        x = np.linspace(t, 2 * np.pi + t, N)
         gui.curve[0][0].setData(x=x, y=np.sin(x))
         gui.curve[1][0].setData(x=x, y=np.cos(x))
         gui.app.processEvents()
         time.sleep(1.0 / 30.0)
-
diff --git a/python/led.py b/python/led.py
index 5d1a596..4a22857 100644
--- a/python/led.py
+++ b/python/led.py
@@ -28,4 +28,4 @@ def update():
 
 if __name__ == '__main__':
     pixels *= 0
-    update()
\ No newline at end of file
+    update()
diff --git a/python/mel_visualization.py b/python/mel_visualization.py
index 2a99c4d..0baf103 100644
--- a/python/mel_visualization.py
+++ b/python/mel_visualization.py
@@ -129,7 +129,7 @@ def visualize_scroll(y):
     g = int(max(y[len(y) // 3: 2 * len(y) // 3]))
     b = int(max(y[2 * len(y) // 3:]))
     p = np.roll(p, 1, axis=1)
-    p*= 0.98
+    p *= 0.98
     p = gaussian_filter1d(p, sigma=0.2)
     p[0, 0] = r
     p[1, 0] = g
diff --git a/python/melbank.py b/python/melbank.py
index 257cd3d..1703387 100644
--- a/python/melbank.py
+++ b/python/melbank.py
@@ -30,7 +30,6 @@ Functions
 ---------
 """
 
-
 from numpy import abs, append, arange, insert, linspace, log10, round, zeros
 
 
@@ -88,7 +87,6 @@ def melfrequencies_mel_filterbank(num_bands, freq_min, freq_max, num_fft_bands):
     lower_edges_mel = frequencies_mel[:-2]
     upper_edges_mel = frequencies_mel[2:]
     center_frequencies_mel = frequencies_mel[1:-1]
-
     return center_frequencies_mel, lower_edges_mel, upper_edges_mel
 
 
@@ -132,7 +130,6 @@ def compute_melmat(num_mel_bands=12, freq_min=64, freq_max=8000,
             num_fft_bands
         )
 
-    len_fft = float(num_fft_bands) / sample_rate
     center_frequencies_hz = mel_to_hertz(center_frequencies_mel)
     lower_edges_hz = mel_to_hertz(lower_edges_mel)
     upper_edges_hz = mel_to_hertz(upper_edges_mel)