Console fails under IPython 6 and Windows

[g-sherman]

Seems to be using IOStream in io.py. The opening of the console in either windowed or dock mode fails with the "fallback required..." message.

class IOStream:

    def __init__(self, stream, fallback=None):
        warn('IOStream is deprecated since IPython 5.0, use sys.{stdin,stdout,stderr} instead',
             DeprecationWarning, stacklevel=2)
        if not hasattr(stream,'write') or not hasattr(stream,'flush'):
            if fallback is not None:
                stream = fallback
            else:
                raise ValueError("fallback required, but not specified")

Any idea where to address this in the console code?

[g-sherman]

Also tried it with ipython[all]==3.1.0 qtconsole and it fails, but with different error:

NoneType object has no attribute flush.

Fails at line 219 kernelbase.py, statement: sys.stdout.flush()

[anitagraser]

ValueError("fallback required, but not specified") went away after I opened the regular Python console as well.