compare lists, match and dupe, detector.

list-comparer.py

import csv

csvfile_A = 'example.csv'
csvfile_B = 'anotherexample.csv'
delimiter = '\n'
data_alpha = []
data_beta = []
data_matched = list()
data_no_matched = list()

with open(csvfile_A, newline='') as csvfile_A:
    csvfile_A = csv.reader(csvfile_A, delimiter=delimiter, quotechar='|')
    for item in csvfile_A:
        data_alpha.append(item)

with open(csvfile_B, newline='') as csvfile_B:
    csvfile_B = csv.reader(csvfile_B, delimiter=delimiter, quotechar='|')
    for line in csvfile_B:
        data_beta.append(line)

# Does the item in Alpha appear in Beta?
for item in data_alpha:
    found_items = 0
    if item in data_beta:
        print(item, 'found')
        data_matched.append(item[0])
    else:
        print(item[0], 'not found')
        data_no_matched.append(item[0])

print(len(data_matched),'matched data',data_matched)
print('\n','+++++++','\n')
print(len(data_no_matched),'unmatched data',data_no_matched)

with open('output.csv', 'w', newline='') as myfile:
    wr = csv.writer(myfile, quoting=csv.QUOTE_ALL)
    wr.writerow([data_matched])