fix lint

Author: SaraPido

sigpro/basic_primitives.py

@@ -34,7 +34,6 @@ class FFTFreq(primitive.FrequencyTransformation):
 
     def __init__(self):
         super().__init__("sigpro.transformations.frequency.fftfreq.fft_freq")
-        
 
 
 class FFTReal(primitive.FrequencyTransformation):

sigpro/transformations/frequency/fftfreq.py

@@ -18,5 +18,5 @@ def fft_freq(amplitude_values, sampling_frequency):
     """
     #frequency_values = np.fft.fftfreq(len(amplitude_values), 1 / sampling_frequency)
     frequency_values = np.arange(0, len(amplitude_values)) * sampling_frequency
-    
-    return np.array(amplitude_values), np.array(frequency_values)
+
+    return np.array(amplitude_values), np.array(frequency_values)

tests/unit/transformations/frequency/test_fftfreq.py

@@ -1,7 +1,7 @@
 """Tests for sigpro.transformations.frequency module."""
 import numpy as np
-from sigpro.transformations.frequency.fftfreq import fft_freq
 
+from sigpro.transformations.frequency.fftfreq import fft_freq
 
 
 def test_fft_freq():