List showing running total of instances

[Pie_Fun]

from collections import Counter           
aList = [1,2,1,2,3,2,1]
bList = []
cList = []
c = collections.Counter()
myDict = {}
count = 1
for x in aList:  
   bList.append(x)
   for y in bList:
       cList.append(y)
   c.update(finalList)
   bList = []
   myDict[count] = {'notecount':dict(c)}
   count = count + 1
   c = collections.Counter()