import csv

# with open('./1.csv', newline='', encoding='utf-8') as f:
#     reader = csv.reader(f)
#     for row in reader:
#         print(row)

with open('./1.csv', 'a', encoding='utf-8') as f:
    writer = csv.writer(f)
    writer.writerow(['4', '猫砂', '25', '1022', '886'])
    writer.writerow(['5', '猫罐头', '18', '2234', '3121'])

[((9, 13, 9, 26), 'csv.writer', 'csv.writer', ({(9, 24, 9, 25): 'f'}, {}), '(f)', False, 'import csv\n')]