Python 日期格式化 及 schwartzian排序

__author__ = 'root'
import datetime
import time
import copy

# 12/Dec/2012:23:59:50
# 12/Sep/2012:23:58:50
# 11/Sep/2012:23:59:50
# 19/Sep/2012:23:58:50
def getTime(dtstr):
print dtstr
time = datetime.datetime.strptime(dtstr, '%d/%b/%Y:%H:%M:%S')
return time.strftime('%Y%m%d%H%M%S')

lines = open('datefmt.txt').readlines()
lines = [i.strip() for i in lines]
line_copy = copy.copy(lines)
lines = [getTime(line) for line in lines]
lines.sort()
for line in lines:
print line

line_copy.sort()
for item in line_copy:
print item

12/Dec/2012:23:59:50
12/Sep/2012:23:58:50
11/Sep/2012:23:59:50
19/Sep/2012:23:58:50
20120911235950
20120912235850
20120919235850
20121212235950
11/Sep/2012:23:59:50
12/Dec/2012:23:59:50
12/Sep/2012:23:58:50
19/Sep/2012:23:58:50