面试编程题TEG

有两个文本文件a.txt、b.txt,格式如下:
a.txt:
1 abc
2 cde
3 bf5
5 dnf
b.txt:
5 dnf
1 poi
2 teg
4 afp
以上两个文件分隔符均为tab,请用python写一个脚本，将以上两个文件内容的差异写到一个文件中，并按照第一列的数字升序排列.

# coding:utf-8
# @Time    : 2018/5/4 14:43
# @Author  : vglede
# @File    : compare_file.py
# @Software: PyCharm Community Edition

import os
import sys


BASE_DIR=os.path.abspath('.')

sys.path.append(os.path.join(BASE_DIR,"conf"))
sys.path.append("F:\\pyscript\\py2\\conf\\")
#print  sys.argv
a_file_path="F:\\pyscript\\py2\\conf\\a.txt"
b_file_path="F:\\pyscript\\py2\\conf\\b.txt"
c_file_path="F:\\pyscript\\py2\\conf\\c.txt"

class Operator_File:
    def read_file(self,Filename):
        self.file = Filename
        with open(self.file,'r') as  f:
            #去除读取文件的\n
            return  ''.join(f.readlines()).strip('\n').split('\n')

    def write_file(self,Filename,contents,type_flag):
        self.file = Filename
        with open(self.file,type_flag) as f:
            if isinstance(contents,list) or  isinstance(contents,tuple):for f_lines in contents:
                    f.write('%s\n'%f_lines)
            elif isinstance(contents,str):
                f.write(contents)
            elif isinstance(contents,dict):
                for item in contents.items():
                    f.write(item)

class FileCompare:
    def compare_file_diff(self,src_list1,src_list2):
        dest_list=[]
        for line in src_list1:
            if line not in src_list2:
                dest_list.append(line)
        return dest_list

#get the object of the class
of=Operator_File()
a_list=of.read_file(a_file_path)
b_list=of.read_file(b_file_path)
#print a_list
#print b_list

cmf=FileCompare()
dest_list=cmf.compare_file_diff(a_list,b_list)+cmf.compare_file_diff(b_list,a_list)
#print dest_list
#print type(dest_list)
#sort默认不写（reverse=False）按照升序排列
# ，需要降序的话reverse=True排序即可
dest_list.sort(reverse=False)
#print dest_list

of.write_file(c_file_path,dest_list,'w+')

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