# %%writefile foo.py
print 'Hello world'

%run foo

Hello world

%%bash
echo "hello from $BASH"

hello from /bin/bash

from IPython.display import display
from ipywidgets import widgets

w = widgets.Dropdown(
    options=['1', '2', '3'],
    value='2',
    description='Number:',
)
display(w)

import sys

sys.