Edited Issue: [0.3.x] sys.stdout.isatty() raises AttributeError [13898]

WinDBG REPL:
```
>>> import sys
>>> sys.stdout.isatty()
Traceback (most recent call last):
File "<console>", line 1, in <module>
AttributeError: 'dout' object has no attribute 'isatty'
>>>
```
Original REPL ( python is the same ):
>>> import sys
>>> sys.stdout.isatty()
True
>>>