A little command-line tool to run through a CSV of post titles and identify which of them are people looking to buy an item.

titleparser.py

#!/usr/local/bin/python3

import sys
import csv

BUYER_CONSTANTS = ('WTB', 'Wtb', 'WANTED', 'Wanted', 'wanted', 'LOOKING FOR',
                   'Looking for', 'looking for', 'TO BUY', 'to buy')


class TitleParser(object):

    def __init__(self, titles):
        self.titles = titles
        self._parse_buyers()

    def _parse_buyers(self):
        print('Parsing buyers...')
        buyer_checklist = []
        for title in self.titles:
            buyer = any([i in title for i in BUYER_CONSTANTS])
            if buyer:
                buyer_checklist.append('YES')
            else:
                buyer_checklist.append('NO')
        self.buyer_checklist = buyer_checklist
        print('Checklist complete--there were %s buyers!'
              % (self.buyer_count()))

    def buyer_count(self):
        count = 0
        for check in self.buyer_checklist:
            if check == 'YES': count += 1   #flake8: noqa
        return count


def main():
    if len(sys.argv) < 2:
        print('\nWhoops--the script requires an argument! Plese use: \n\n'
              '\tpath/to/the/titleparser.py path/to/the/csv_file.csv\n\n'
              'to specify the .csv file to be parsed.\n')
        sys.exit(1)

    try:
        with open(sys.argv[1], 'rt', encoding='utf-8') as csvfile:
            reader_object = csv.reader(csvfile, delimiter='φ', quotechar='ɣ')
            row_list = []
            csv_size = 0
            for row in reader_object: # "row" not yet list object
                row_list.append(row) # a list of 1-element list objects
                csv_size += 1

    except IOError:
        print("\nSorry, but there seems to be something wrong with the file "
              "passed as the argument! Please make sure:\n\n"
              "\t1. it's a .csv file (with a .csv prefix),\n"
              "\t2. you have the requisite permissions to read it, and\n"
              "\t3. you're pointing to the right filepath/in the right "
              "working directory.\n")
        sys.exit(1)

    print(csv_size)
    titles = [(''.join(i)+'') for i in row_list]

    title_parser = TitleParser(titles)

    print(len(title_parser.titles), 'titles')

    new_filename = sys.argv[1][:-4] + '-buyers.csv'
    with open(new_filename, 'w+', encoding='utf-8',
              newline='') as new_csvfile:
        writer_object = csv.writer(new_csvfile, delimiter='`',
                                   quotechar='|')
        for i in title_parser.buyer_checklist:
            writer_object.writerow([i])


if __name__ == '__main__':
    main()