[Python] List construction by concatenation after FFT [closed]

Is there a simpler Way to construct frequency components after FFT?

I am computing the FFT of a signal and normalizing it as follows:

import numpy as np
from scipy.fftpack import fft

# By calculating FFT...
Y = fft(y) / n # FFT computing and normalization
# Constructing a new list with one-sided frequency range
Y = [Y[0]] + [2 * Y for i in range(1, n//2)]


This works correctly, but I initially attempted a more compact form:

Y = [Y[0]] + [2 * Y[range(1, n//2)]] # This does NOT work


which will actually increase to 2D instead of concatenating indices from 0 to 1:n//2.

My question is: Is there a simpler or more Pythonic way to achieve this one-sided frequency range construction? Ideally, something cleaner than my working solution while maintaining efficiency.

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