troubleshooting Question

Python - Deduplicating and Capturing Duplicates

Avatar of bsumariwalla
bsumariwalla asked on
Python
7 Comments2 Solutions215 ViewsLast Modified:
Hello,

I'm using Python 2.7 and I have a lists of lists with lists.  I'm trying to deduplicate the list of lists and also return every duplication.  How can I do this?  I seem to have code that deduplicates okay, but I can figure out the second part.  Consider the following list

[["apple", "red"]
["apple", "red"]
["apple", "red"]
["apple", "green"]
["banana", "yellow"]]

I'm trying to return
Uniques:
[["apple", "red"]
["apple", "green"]
["banana", "yellow"]]

Duplicates:
[["apple", "red"]
["apple", "red"]]

def csv_deduplicate2(csv_list):
    sorted_by_date = sorted(csv_list, key=lambda row: row[2], reverse=True)
    unique_csv_list = []
    duplicate_csv_list = []
    for sorted_row in sorted_by_date:
        if sorted_row not in unique_csv_list:
            unique_csv_list.append(sorted_row) # Produces a unique list
    for sorted_row in sorted_by_date:
        if sorted_row in unique_csv_list:
            duplicate_csv_list.append(sorted_row) # Produces a list of everything, not just duplicates.
    return unique_csv_list, duplicate_csv_list
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