How to create a list in Python with the unique values of a CSV file?

Question

I have CSV file that looks like the following,

1994, Category1, Something Happened 1
1994, Category2, Something Happened 2
1995, Category1, Something Happen         


        

Answer 1

You can do:

DataCaptured = csv.reader(DataFile, delimiter=',', skipinitialspace=True) 

Category, Year = [], []
for row in DataCaptured:
    if row[0] not in Year:
        Year.append(row[0])
    if row[1] not in Category:
        Category.append(row[1])    

print Category, Year        
# ['Category1', 'Category2', 'Category3'] ['1994', '1995', '1996', '1998']

---

As stated in the comments, if order does not matter, using a set would be easier and faster:

Category, Year = set(), set()
for row in DataCaptured:
    Year.add(row[0])
    Category.add(row[1])