关于用python重构terminal下的词典

    好久没有更新blog了，一方面因为还在学习python，又在看linux的网络内核，真心忙不过来。学习python有那么一段时间了，感觉它的内容真的很多阿，还得继续努力。以前用bash写过一个终端下的在线词典的东西。后来学习python就一直想过用python重构一下。下面是源码，基本思路都一样，只是还没有想到一种好的数据结构进行历史内容的存储。其实有想过用pickle，但是每次都得将其全部导入内存，就像fcitx的词库一样。PS：我重新编译过fcitx的词库，导致其占用内存很大。唉，任何事情都是两面的，每一种所谓的最佳解决办法，其实就是一种折中罢了。所以，我就使用了原来扒取的xml，这样再次在本地读取的时候就少了很多事。

      对了还有一点就是，本来有个比较好的想法的，就是利用和OS一样查找寄存器和内存的并行操作来解决，查找本地历史记录和网上结果，谁先给出结果就kill掉另一个，但是threading只是提供创建线程，而且它忽略了函数返回值，我想过用一个全局变量来作为一个标志，但是当时用锁的时候，其他申请锁的线程都阻塞了，这样还是没有达到我的想法。如果你有好的思路希望能分享一下。愿与君共勉之。

#!/usr/bin/python
#encoding=utf-8
#===============================================================================
#
# FILE: pdic
#
# USAGE: pdic [word]
#
# DESCRIPTION: The dictionary based on Terminal
#
# OPTIONS: ---
# REQUIREMENTS: ---
# BUGS: ---
# NOTES: ---
# AUTHOR: Eric Yu , [e-mail]
# LICENCE: GPL
# CREATED:
# REVISION: ---
#===============================================================================

from xml.etree import ElementTree
import threading
import re
import os
import sys
import urllib2

'''The word you want to search\
        and the place thar stored the word directory'''
word = ''
word_dir = r'word_dir'

#content = urllib2.urlopen(r'%s'% word)

#mean = content.read()

#file = open('file','w+')
#file.write(mean)
#file.close()

'''Use to replace  , '''
parleft = re.compile(r'')
parright = re.compile(r'')

def print_node(node):
    '''Show the meaning of the word\
            and replace  , '''
    string = re.sub(parleft,'<',node.text)
    text = re.sub(parright,'>',string)
    print '%s'% text


#read_xml(mean)

def Judge():
    '''判断是否存在字典文件夹，不存在建立'''
    global word_dir
    if os.path.exists(word_dir):
        if os.path.isdir(word_dir):
            pass
        else:
            print "There is file named %s"% word_dir
            return 0
    else:
        try:
            os.mkdir(word_dir)
        except:
            print "Fail to create the directory"
            return 0
        else:
            print "First Use:Created the directory"
            return 1

def Usage():
    '''判断输入是否正确'''
    if len(sys.argv) != 2:
        print "Usage: %s [word]"% sys.argv[0]
        return 0
    else:
        global word
        word = sys.argv[1]

class Word:
    def __init__(self,word):
        self.word = word
        self.url = r'%s'% self.word

    def GetUrl(self):
        global word_dir
        file = word_dir + '/' + self.word + '.xml'
        try:
            content = urllib2.urlopen(self.url)
        except:
            print "Fail to download"
            return 0
        self.mean = content.read()
        if re.search(r'|Not Found',self.mean):
            return 1
        else:
            wf = open(file,'w')
            wf.write(self.mean)
            wf.close()
            if self.mean == '':
                print "Fail to download"
                return 0

    def Read_xml(self):
        root = ElementTree.fromstring(self.mean)
        '''root.find() 返回的为None。'''
        node_find = root.getiterator('def')
        if not node_find:
            pass
        else:
            for i in node_find:
                print_node(i)

        lst_node = root.getiterator("sent")
        if not lst_node:
            pass
        else:
            for i in lst_node:
                child = i.getchildren()
                for j in child:
                    lst_node_child = j
                    print_node(lst_node_child)

        node_sugg = root.getiterator('sugg')
        if not node_sugg:
            pass
        else:
            for i in node_sugg:
                print_node(i)

    def local_xml(self):
        '''Read the word file local'''
        global word_dir
        file = word_dir + '/' + self.word + '.xml'
        if os.path.exists(file) and os.path.isfile(file):
            wf = open(file)
            self.mean = wf.read()
            if not len(self.mean):
                return 0
            wf.close()
            return 1
        return 0

def main():
    if Usage() == 0:
        sys.exit()
    if Judge() == 0:
        sys.exit()
    tran = Word(word)
    if tran.local_xml() == 0:
        if tran.GetUrl() == 0:
            print 'Error'
            sys.exit()
        else:
            tran.Read_xml()
    else:
        tran.Read_xml()
    return 1


if __name__ == '__main__':
    main()