过滤手机号码的python程序

import re;
def extract_mobile(file_source, file_dest):
print file_source, file_dest
mobile_re = re.compile('(1[3,5][0-9]{9})');
try:
file_src = open(file_source);
file_out = open(file_dest, "w");
except:
print "file isn't exist!"
return

try:
for line in file_src:
#print line
line = line.strip();
if mobile_re.search(line) :
group = mobile_re.search(line).groups();
#print group[0]
file_out.write(group[0] + "\n")
else:
print line
finally:
print "abc"
file_src.close();
file_out.close();

if __name__ == "__main__":
extract_mobile(r"E:\temp\a.txt", r"E:\temp\b.txt")