There is a Javascript-only spellchecker available now from Doug Blank:

• Demonstration
• Installation
• Installation Video

It is recommended to use the above spellchecker instead of this aspell-based one.

This IPython notebook extension allows spellchecking using aspell (http://aspell.net/). It allows spell checking as you type in markdown cells or on demand using a toolbar button for any cell type.

The technical implementation is a server side spell checker, that communicates with the IPython notebook over a websocket.

A short demo video can be found here: http://www.youtube.com/watch?v=yk5ID5SAlLw

• First you need to have the program aspell installed on a computer.
• Next, you need the aspell-python package (https://pypi.python.org/pypi/aspell-python-py2 or https://pypi.python.org/pypi/aspell-python-py3).
• Finally, start ipy-aspell-server.py. If you want to run it in background, use something like nohup python ipy-aspell-server.py &.

For now the spell check language is configured to english in the line

s = aspell.Speller('lang', 'en')

of ipy-aspell-server.py.

Now install the IPython notebook extension: follow the installation instructions appropriate to your IPython version as explained on the main wiki home pages:

• Home generic
• Home 4.x (Jupyter)
• Home 3.x
• Home 2.x

If the computer ipy-aspell.py is running on is also running the IPython notebook server, add the line

var wsUri = "ws://" + document.domain + ":8889/"+ "websocket";

to ipy-aspell.js. If you use another computer, please add

var wsUri = "ws://" + "**my computer name**" + ":8889/"+ "websocket";

This extension needs some testing. Also, it does not do much error checking for now. Feedback and enhancements are welcome.

As all text to be spellchecked is transferred over the network unencrypted, this can be a major security risk. Also, someone might modify the server program ipy-aspell-server.py to spy on you. Therefore, you should only use the spellchecker when it running on your local machine or setup.

The communication between the computer running ipy-aspell.py and the IPython notebook extension ipy-aspell.js running in your browser is realized using websockets at port 8989.

The notebook extensions sends each word to be spell checked using a JSON string "text":word, "line": i, "start":start, "end":end, "id":cell.cell_id and receives back antother JSON string "text":curWord, "line": cur.line, "start":start, "end":end, "id":cell.cell_id. If curWord is returned as true from aspell, then it is not a valid word in the dictionary and will be marked using CodeMirrors markText()`. The marking can be cleared either by typing on or by clicking on the trashcan toolbar symbol.