Trying Jupiter Notebook online 

First, go to https://jupyter.org/try. You will see something like this:

To try Jupyter with Python online, click on the Python option, or paste this URL into your web browser: https://mybinder.org/v2/gh/ipython/ipython-in-depth/master?filepath=binder/Index.ipynb. Once the page has loaded, you can start coding/loading notebooks.