save csv with row value

save_csv.py

with open('sample.csv') as f:
    prev = []
    for line in f.readlines():
        print(prev, line)
        if len(prev) == 0:
            prev.append(line)
        elif prev[-1] != ','.join(line.split(',')):
            file_name = ''.join(prev[-1].strip().split(',')) + '.csv'
            with open(file_name, 'w') as new_file:
                for prev_line in prev:
                    new_file.write(prev_line)
            prev = [line]
        else:
            prev.append(line)
    if len(prev) > 0:
        file_name = ''.join(prev[-1].strip().split(',')) + '.csv'
        with open(file_name, 'w') as new_file:
            for prev_line in prev:
                new_file.write(prev_line)