bytes() in python 2

Not sure if this is a bug or intended behavior, but

```py
bytes([1, 2])
```

does not raise any warnings. In Python 2, `bytes` is treated as `str`. On one hand, it makes sense that no warning is issued as `str([1, 2])` is still valid code and will compile. But from a logical perspective, the code is inherently different. Python 3 will return `b"\x01\x02"` whereas Python 2 produces `"[1, 2]"`.
