The document discusses the inner workings of IPython, particularly its architecture and how code execution is handled through kernels. It outlines the message structure used for executing code and the interaction with various programming languages. Additionally, it provides insights into the development of notebooks and their functionality within the IPython environment.

1. IPython from 30,000 feet
Thomas Kluyver
http://ipython.org/ipython-doc/dev/development/how_ipython_works.html
sweetclipart.com

2. REPLs
while True:
code = input(">>> ")
exec(code)

3. Kernels

4. Messages
{
"header": {
"msg_type": "execute_request",
…}
"content": {
"code": "print('Hello, world')",
…}
…}

5. Kernels for other languages

6. Notebooks