枚举文件加入特定字符串

import os,os.path
path = os.path
class VersionOper(object):
    'The version appendor class .'
    __dir =''
    __appendStr='mrjeye'
    __isDebug =False
    __doType =()

    def debug(self,msg):
        'prints the msg if debug mode .'
        if not self.__isDebug:
            return
        print 'JDebug , msg :%s' %msg

    def addType(self,item):
        'add the oper type .'
        self.__doType =self.__doType.__add__((item,))

    def __init__(self,path,s='mrjeye',isDebug=False):
        if not os.path.exists(path):
            raise IOError('path %s is not exists !' %path)
        self.__dir = path
        self.__appendStr = s        #the string what user want to append
        self.__isDebug = isDebug

    def append(self):
        'begin to enum and try append data .'
        self.enum(self.__dir)

    def enum(self,_path):
        'Enum files in _path .'
        items = os.listdir(_path)
        for item in items:
            _npath = path.join(_path,item)
            if path.isfile (_npath):
                self.debug('enum a fiile :%s' % _npath)
                if self.isNoDo(_npath):
                    continue
                self.doAppend(_npath)
            elif path.isdir (_npath):
                self.debug('enum a dir :%s' % _npath)
                self.enum(_npath)

    def doAppend(self,f):
        'append str to a file .'
        try:
            _file = file(f,'a');
            #lines = _file.readlines()
            #for line in lines:
            _file.write(self.__appendStr)
            _file.close()
            self.debug('append to %s success !' %f)
        except IOError , e:
            self.debug( 'error to append file , msg :%s' %e)

    def isNoDo(self,f):
        'check the file .'
        ft = self.getFileType(f)
        self.debug(ft)
        for item in self.__doType:
            if ft == item:
                return False
        return True

    def getFileType(self,f):
        ret =''
        for i in range(len(f)):
            if f[i] =='.':
                ret = f[i+1:]
        return ret

if __name__ == '__main__':
    vo = VersionOper('c:\\1','test append',True)
    #append two file type to the oper object
    vo.addType('txt')
    vo.addType('log')

    vo.append()