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from datetime import datetime

filepath = 'hoge.csv'
with open(filepath, encoding='utf-8') as f:
  for row in f:
    columns = row.split(',')
    x1 = columns[0].strip()
    x2 = int(columns[1].strip())
    x3 = datetime.strptime(columns[3].strip(), '%Y-%m-%d %H:%M:%S')

with open('output/timecard.log', 'a', encoding='utf-8') as f:
    # 書き込み
    f.write(write_string)