In [1]:
from IPython.display import IFrame

iframe to website

In [2]:
IFrame("http://www.ipython.org", 500,300)
Out[2]:

iframe to Google Docs

In [3]:
IFrame("https://docs.google.com/document/d/1MTXhf65TfKc0M7nYNyVB04-93r2ww_K95snYC8QGn9M/pub", 500, 300)
Out[3]: