fix lint

Author: SaraPido

sigpro/transformations/frequency/fftfreq.py

@@ -16,7 +16,7 @@ def fft_freq(amplitude_values, sampling_frequency):
             * `amplitude_values (numpy.ndarray)`
             * `frequency_values (numpy.ndarray)`
     """
-    #frequency_values = np.fft.fftfreq(len(amplitude_values), 1 / 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)

tests/unit/transformations/frequency/test_fftfreq.py

@@ -7,7 +7,7 @@
 def test_fft_freq():
     # setup
     amplitude_values = [1.5, -0.5, 2.0, 0.5, -1.0]
-    sampling_frequency = 2  # in Hz
+    sampling_frequency = 2
 
     # run
     amplitude_result, frequency_result = fft_freq(amplitude_values, sampling_frequency)