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    <pre><code>import sys #Read the input file input_data = [line.rstrip().split(",") for line in open("input.txt", 'r').readlines()] #Put the value and index of each line into a dict, #categorizing by the dataset/group name. #Each different dataset/group is a key of the dict, #and each key's value is a list. group_dict = {} index = 0 for line in input_data: group_key = line[0]+","+line[1] if group_key not in group_dict.keys(): group_dict[group_key] = [] group_dict[group_key].append([index, line[2], None]) index += 1 #Sort each list of the dict by the numbers. #Make blank to be a very large number. for key in group_dict.keys(): group_dict[key] = sorted(group_dict[key], key=lambda x: sys.maxint if x[1]=="" else int(x[1])) #####group_dict[key] = group_dict[key][::-1] ##### Uncomment the above line to sort in descending order #Check if there're multiple items with the same number, #If so, set them by the same rank. group_dict[key][0][2] = 1 for i in range(1, len(group_dict[key])): group_dict[key][i][2] = (group_dict[key][i-1][2] if group_dict[key][i][1] == group_dict[key][i-1][1] else i+1) #In order to keep the same line order with the input file, #get all the lists together into a new list, #and sort them by the line index (recorded when put them into the dict). rank_list = [] for rank in group_dict.values(): rank_list += rank rank_list = sorted(rank_list, key=lambda x: x[0]) for rank in rank_list: input_data[rank[0]][4] = str(rank[2]) #Output the final list. for line in input_data: print ",".join(line) </code></pre> <hr> <p>Test:</p> <p>Input:</p> <pre><code>uniquedata1,uniquecell1,123,data,99,data uniquedata1,uniquecell1,,data,99,data uniquedata1,uniquecell1,111,data,99,data uniquedata2,uniquecell2,456,data,99,data uniquedata2,uniquecell2,,data,99,data uniquedata2,uniquecell2,,data,99,data uniquedata2,uniquecell2,789,data,99,data uniquedata1,uniquecell2,386,data,99,data uniquedata1,uniquecell2,512,data,99,data uniquedata1,uniquecell2,486,data,99,data </code></pre> <p>Output:</p> <pre><code>uniquedata1,uniquecell1,123,data,2,data uniquedata1,uniquecell1,,data,3,data uniquedata1,uniquecell1,111,data,1,data uniquedata2,uniquecell2,456,data,1,data uniquedata2,uniquecell2,,data,3,data uniquedata2,uniquecell2,,data,3,data uniquedata2,uniquecell2,789,data,2,data uniquedata1,uniquecell2,386,data,1,data uniquedata1,uniquecell2,512,data,3,data uniquedata1,uniquecell2,486,data,2,data </code></pre>
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    1. PORanking CSV numbers in both ascending and descending orders in python
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    1. USSkyler
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      1. VTUpMod
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