python 输出重定向

使print既打印到终端，又写入文件

 class Tee(object):
     def __init__(self,*files):
         self.files = files
     def write(self,obj):
         for f in self.files:
             f.write(obj)

 if __name__ == '__main__':
     logname = './new_file.txt'
     with open(logname,'w') as logfile:
     　　original = sys.stdout
     　　sys.stdout = Tee(sys.stdout,logfile)
     　　// test
     　　print '*********************'
     　　print 'Well Done!'
     　　sys.stdout = original