Python-сообщество

file_input  = open('test.txt')
file_input2  = open('test.txt')

file_read = file_input.read()

file_list = file_read.split(",")
data_list = []
for i in file_input2:
    i = str('\n' + i.strip())
    print i
    key = file_list.index(i)
    data = '{0}${1}\n'.format(i,key)

    data_list.append(data)

from sets import Set
#
def countDuplicatesInList(dupedList):
   uniqueSet = Set(item for item in dupedList)
   return [(item, dupedList.count(item)) for item in uniqueSet]
#
lst = ['I1','I2','I1','I3','I4','I4','I7','I7','I7','I7','I7']
print countDuplicatesInList(lst)

def DupCount(li):
    d={}
    for i in li:
        v=d.get(i,0)
        d[i]=v+1
    return d

print DupCount([1,1,1,2,2,3,4,4,4,4])