原因：

QT项目中，发现QTextEdit QPlainTextEdit的右键菜单翻译不全，跟踪代码发现是未翻译qtbase.ts的QWidgetTextControl节点，且未见有qtbase_CN.ts版本。

然后就以日文版的qtbase_ja.ts为模板，把QWidgetTextControl节点翻译到qt_zh_CN.ts中，在编译为二进制用于项目中。

注意：u"###5 Translate  escape character." 这个模块的功能是还原xml节点的text含' "时，在编程xml时会被转义为"&;"的问题。

用法：

call merge_translate.py "\src\qtbase_ja.ts" "\src\qt_zh_CN_.ts" "\src\qt_zh_CN.ts"

代码：

#coding=utf-8  

from bs4 import BeautifulSoup
import lxml
import re
import os,sys


'''
<context>
<name>CloseButton</name>
<message>
<source>Close Tab</source>
<translation>xxxxxxxxxxxxxxxxxxx</translation>
</message>
</context>
'''

def doTranslate(pathJa, pathCNTemp, pathCN):    
    print pathJa, pathCNTemp, pathCN
    #os.system("pause")    
    
    print u"###1 read Translation file."
    contentsJA= ""
    with open(pathJa) as f:
        for line in f.readlines():
            contentsJA += line
    soupJA = BeautifulSoup(contentsJA, "xml")
    

    print u"###2 get Translation node."
    listContents = [ item for item in soupJA.find_all('context') if item('name')[0].contents[0] == u'QWidgetTextControl']

    if 0 == len(listContents):
        print u" QWidgetTextControl not exist，return"
        return

    #清空原来的翻译内容
    QWidgetTextControlContents = listContents[0]
    for item in listContents[0].findChildren('message'):
        item('translation')[0].contents[0]=u''
        

    print u"###3 insert Translation node."
    contentsCN= ""
    with open(pathCNTemp) as f:
        for line in f.readlines():
            contentsCN += line
    soupCN = BeautifulSoup(contentsCN, "xml")

    listContentsCN = [ item for item in soupCN.find_all('context') if item('name')[0].contents[0] == u'QWidgetTextControl']
    
    if 0 == len(listContentsCN):
        lastContents = soupCN.find_all('context')[-1]
        lastContents.insert_after(QWidgetTextControlContents)        


    print u"###4 Translate null  word entry."
    for item in soupCN.find_all('context')[-1].findChildren('message'):
        if 0 == len(item.translation.contents[0]):
            listTemp = [train for train in soupCN.find_all('message') if item.source.contents[0] == train.source.contents[0] and  0 != len(train.translation.contents[0])]
            #print listTemp
            if len(listTemp) > 0:
                temp = listTemp[0]
                item.translation.contents[0] = temp.translation.contents[0]



    print u"###5 Translate  escape character."
    t =  str(soupCN)
    while re.findall( r"(>.*?)'", t ):
        t = re.sub(r"(>.*?)'", r"\1'", t)    

    while re.findall( '''(>.*?)\"''', t ):
        t = re.sub('''(>.*?)\"''', r"\1"", t)
    
    print u"###6 save file."
    fo = open(pathCN, "w+")
    fo.write( t)
    fo.close()


    
if __name__ == "__main__":    
    #print sys.argv
    print sys.getdefaultencoding()
    if 4 > len(sys.argv):
        print u"please input qtbase_ja.ts  qt_zh_CN_.ts  qt_zh_CN.ts full path."
    else:
        doTranslate(sys.argv[1], sys.argv[2], sys.argv[3])