python解决一些错误换行问题

20141010,aaa,bbb,ccc,ddd,eee

20141010,aaa,bbb,
ccc,ddd,
eee

import re

dfile=open('tt.txt','r')
lists=[]
for line in dfile:
m=re.match('2014.+',line)
if m:
lists.append(line)
else:
lists[-1]=lists[-1].strip('\n')+line

print lists

ofile=open('ttt.txt','w')
for line in lists:
ofile.write(line)

dfile.close()
ofile.close()