使用二分法查找mobile文件中区号归属地

#!/usr/bin/env python
#coding:utf-8
'''
Created on 2015年12月8日

@author: DL

@Description： 使用二分法查找mobile文件中区号归属地
'''
import os
import sys

class SearchAreacode(object):
    
    def __init__(self,file_name='mobile_sort'):
        self.fp = open(file_name)
        self.fp.seek(0,os.SEEK_END)
        self.size = self.fp.tell()
        self.fp.seek(0,os.SEEK_SET)
    
    def Search_Areacode(self,areacode,start_p = 0):
        fp_start = start_p
        fp_end = self.size
        
        while fp_start < fp_end:
            mid = fp_start + (fp_end - fp_start)/2
            self.fp.seek(mid,os.SEEK_SET)
            
            self.Search_LineHead()
            
            line = self.fp.readline()
            val = self.Search_cmp(areacode[3][:9], line)
            if val == 0:
                ac,province,provider=line.split('|')
                print "%s|%s|%s"%(province,areacode[3],areacode[4])
                break 
            elif val == 1:
                fp_start = self.fp.tell()
            else:
                fp_end = mid
        #print areacode
    def Search_cmp(self,areacode,line):
        tmp = line.split('|')
        return cmp(areacode,tmp[0])
            
            
    def Search_LineHead(self):
        while self.fp.tell() > 0:
            self.fp.seek(-1,os.SEEK_CUR)
            val = self.fp.read(1)
            if val == '
':
                break
            #print val
            self.fp.seek(-1,os.SEEK_CUR)
    def Search_DeInit(self):
        self.fp.close()
        

if __name__ == '__main__':
    # 通过管道输入
    log_line = sys.stdin.readlines()
    obj = SearchAreacode('area_code.txt')
    for line in log_line:
        content = line.split(' ')
        #print content[3][:9]
        obj.Search_Areacode(content)

    obj.Search_DeInit()