How to read the original data line by line from stdin in python 3 just like python 2?

[Peng Yu]

Suppose that I use this to read from stdin. But `line` contains
decoded data in python 3. In python 2, it contains the original data.
What is the best way to get the original data in python 3? Thanks.

```
for line in sys.stdin:
   ...
```

-- 
Regards,
Peng