date
    20171012
    20171011
    20171010
    20171009
    20171006
    20171005
    20171004

date,value,etc...
    20171012,2501593,etc..
    20171011,2176309,etc..
    20171010,3484064,etc..
    20171009,1785852,etc..
    20171006,1785852,etc..
    20171005,16476641,etc..
    20171004,1235406,etc..

import csv
data = [] # Buffer list
files = ['./CalculatedOutput/quote_date.csv', './CalculatedOutput/paper.csv', './CalculatedOutput/exch.csv', './CalculatedOutput/open.csv', './CalculatedOutput/high.csv', './CalculatedOutput/low.csv', './CalculatedOutput/close.csv', './CalculatedOutput/volume.csv', './CalculatedOutput/value.csv']

for filename in files:
    with open(filename, 'r') as csvfile:
        stocks = csv.reader(csvfile)
        for row in stocks:
        new_row = [row[0]]
        data.append(new_row)
            with open("CalculatedOutput/Opera.csv", "w+") as to_file:
                    writer = csv.writer(to_file , delimiter=",")
            for new_row in data:
                        writer.writerow(new_row)