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gistfile1.py

outerdic = {}
 
with open('F-F_Research_Data_Factors_daily.txt') as fh:
    lines = fh.readlines()
    slicedline = lines[6:-2]
    header = lines[5].split()
    for element in slicedline:
        date = element.split()[0][:6]
        outerdic[date] = outerdic.setdefault(date, [])
        outerdic[date].append(float(element.split()[1]))
     
 
    sorteddic = sorted(outerdic, key=int)
 
 
    keys = sorteddic
 
    for key in keys:
        mkfrflist = outerdic[key]
        sumdic = sum(mkfrflist)
        print key + ': sum {0}, len {1}, avg {2}'.format(sumdic,len(mkfrflist), sumdic/len(mkfrflist))