Python: Index Error: List Index out of range

So I am running a program with two threads: One collecting Data and the other processing it. The problem is that after a certain amount of data collected and processed I get the error

File "...", line 54, in get_ratio
alpha=fft_avg_mod[d]
Index Error: List Index out of range

Even though I'm emptying the lists after every iteration as shown in the code. Appreciate any help or ideas

def get_data(q):
mindwaveDataPointReader = MindwaveDataPointReader()
mindwaveDataPointReader.start()

data=
while(1):
dataPoint = mindwaveDataPointReader.readNextDataPoint()
if (dataPoint.__class__ is RawDataPoint):
data.append(dataPoint)
q.put(data) #data keeps going into the queue

def get_ratio(q):
M = [,,,,,,,]
fft_avg =
fft_avg_mod =
#loop to cover all the data
j=0
k=0
l=0

while(1):
data = q.get()
if k > 7 :
fft_avg[:] = #emptying
fft_avg_mod[:] =
fft_avg = [(l1+l2+l3+l4+l5+l6+l7+l8)/8 for l1,l2,l3,l4,l5,l6,l7,l8 in zip(M[0],M[1],M[2],M[3],M[4],M[5],M[6],M[7])]
fft_avg_mod = [ abs(x) for x in fft_avg]


if fft_avg_mod:
d=random.randint(8,14)
e=random.randint(14,20)
alpha=fft_avg_mod[d] #THE ERROR
beta=fft_avg_mod[e]
ratio=beta/alpha
print 'ratio' , ratio
f=k%8
M[f] = np.fft.fft(data[j:j+32])
j = j + 32
k = k + 1


if __name__ == '__main__':

q = Queue.Queue(maxsize=0)

try:
threadLock = th.Lock()
threads=
thread1=th.Thread( target=get_data, args=(q,))
thread2=th.Thread( target=get_ratio, args=(q,))
thread1.start()
print 'T1 started'
time.sleep(10)
thread2.start()
print 'T2 started'
threads.append(thread1)
threads.append(thread2)
for t in threads:
t.join()
except:
print "Error: unable to start thread"


IndexError

fft_avg_mod

d

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