from scipy.fft import fft, ifft
import numpy as np
import matplotlib.pyplot as plt
#def twid(n,m,v):
#    return numpy.exp(2*math.pi*j*-(m*v)/n)
#def fft(f):

x = np.linspace(0,12,256, endpoint=False)
f = np.cos(x)
F = fft(f)

plt.plot(x,F)
plt.show()