Python / Python 기본 파일 입출력, Parsing

import MySQLdb
import datetime
import time

fopen = open("sample.txt", "r")
fresult = open("data3_drug_era.txt", "w")

def split_date(_date):
	arrDate = _date.split("-")
	return datetime.date(int(arrDate[0]), int(arrDate[1]), int(arrDate[2]))

try:
	group = []
	for i, each_line in enumerate(fopen):

		(pk, concept, person, visit, a, value, start, end, interval, unit, quantity, import_date) = each_line.split("\t")
		import_date = import_date.strip()

		day_start = split_date(start)
		day_end = split_date(end)

		day_interval = day_start + datetime.timedelta(weeks=1)

		print i, pk, day_start, day_interval

except IOError:
	print "Error"

fresult.close()
fopen.close()