python对txt文件内容排序并输出

很简单所以就不多解释了！

path = 'E:\\PyWk\\nodepad_py\\'
fp = open(path + 'm.txt')
a = fp.readlines()
a = [x.split('\t') for x in a]
a = [[x[0],x[1].replace('\n','')] for x in a]
print a
fp.close()

b = [[int(x[0]), int(x[1])] for x in a]
b.sort()
b = [str(x[0]) + '\t' + str(x[1]) + '\n' for x in b]
fp = open(path+'n.txt', 'w')
fp.writelines(b)
fp.close()
print b