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321 lines
9.5 KiB
321 lines
9.5 KiB
{
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"metadata": {
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"name": ""
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},
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"nbformat": 3,
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"nbformat_minor": 0,
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"worksheets": [
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{
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"cells": [
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{
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"cell_type": "heading",
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"level": 1,
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"metadata": {},
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"source": [
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"The Frontend/Kernel Model"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"The traditional IPython (`ipython`) consists of a single process that combines a terminal based UI with the process that runs the users code.\n",
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"\n",
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"While this traditional application still exists, the modern IPython consists of two processes:\n",
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"\n",
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"* Kernel: this is the process that runs the users code.\n",
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"* Frontend: this is the process that provides the user interface where the user types code and sees results.\n",
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"\n",
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"IPython currently has 3 frontends:\n",
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"\n",
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"* Terminal Console (`ipython console`)\n",
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"* Qt Console (`ipython qtconsole`)\n",
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"* Notebook (`ipython notebook`)\n",
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"\n",
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"The Kernel and Frontend communicate over a ZeroMQ/JSON based messaging protocol, which allows multiple Frontends (even of different types) to communicate with a single Kernel. This opens the door for all sorts of interesting things, such as connecting a Console or Qt Console to a Notebook's Kernel. For example, you may want to connect a Qt console to your Notebook's Kernel and use it as a help\n",
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"browser, calling `??` on objects in the Qt console (whose pager is more flexible than the\n",
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"one in the notebook). \n",
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"\n",
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"This Notebook describes how you would connect another Frontend to a Kernel that is associated with a Notebook."
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]
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},
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{
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"cell_type": "heading",
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"level": 2,
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"metadata": {},
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"source": [
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"Manual connection"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"To connect another Frontend to a Kernel manually, you first need to find out the connection information for the Kernel using the `%connect_info` magic:"
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]
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"%connect_info"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"{\n",
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" \"stdin_port\": 52858, \n",
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" \"ip\": \"127.0.0.1\", \n",
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" \"hb_port\": 52859, \n",
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" \"key\": \"7efd45ca-d8a2-41b0-9cea-d9116d0fb883\", \n",
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" \"shell_port\": 52856, \n",
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" \"iopub_port\": 52857\n",
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"}\n",
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"\n",
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"Paste the above JSON into a file, and connect with:\n",
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" $> ipython <app> --existing <file>\n",
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"or, if you are local, you can connect with just:\n",
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" $> ipython <app> --existing kernel-b3bac7c1-8b2c-4536-8082-8d1df24f99ac.json \n",
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"or even just:\n",
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" $> ipython <app> --existing \n",
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"if this is the most recent IPython session you have started.\n"
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]
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}
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],
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"prompt_number": 6
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"You can see that this magic displays everything you need to connect to this Notebook's Kernel."
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]
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},
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{
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"cell_type": "heading",
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"level": 2,
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"metadata": {},
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"source": [
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"Automatic connection using a new Qt Console"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"You can also start a new Qt Console connected to your current Kernel by using the `%qtconsole` magic. This will detect the necessary connection\n",
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"information and start the Qt Console for you automatically."
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]
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"a = 10"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 1
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"%qtconsole"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 2
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},
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{
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"cell_type": "heading",
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"level": 2,
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"metadata": {},
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"source": [
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"The kernel's `raw_input` and `%debug`"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"The Notebook has added support for `raw_input` and `%debug`, as of 1.0."
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]
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"# Python 3 compat\n",
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"import sys\n",
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"if sys.version_info[0] >= 3:\n",
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" raw_input = input"
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],
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"language": "python",
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"metadata": {},
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"outputs": [],
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"prompt_number": 1
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"name = raw_input(\"What is your name? \")\n",
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"name"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"What is your name? Sir Robin\n"
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]
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},
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{
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"metadata": {},
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"output_type": "pyout",
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"prompt_number": 2,
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"text": [
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"'Sir Robin'"
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]
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}
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],
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"prompt_number": 2
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"**Python 2-only**: the eval input works as well (`input` is just `eval(raw_input(prompt))`)"
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]
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"fingers = input(\"How many fingers? \")\n",
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"fingers, type(fingers)"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"How many fingers? 4\n"
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]
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},
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{
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"metadata": {},
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"output_type": "pyout",
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"prompt_number": 3,
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"text": [
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"(4, int)"
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]
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}
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],
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"prompt_number": 3
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"def div(x, y):\n",
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" return x/y\n",
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"\n",
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"div(1,0)"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"ename": "ZeroDivisionError",
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"evalue": "integer division or modulo by zero",
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"output_type": "pyerr",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mZeroDivisionError\u001b[0m Traceback (most recent call last)",
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"\u001b[1;32m<ipython-input-4-a5097cc0c0c5>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;32mreturn\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m/\u001b[0m\u001b[0my\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 3\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 4\u001b[1;33m \u001b[0mdiv\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[1;32m<ipython-input-4-a5097cc0c0c5>\u001b[0m in \u001b[0;36mdiv\u001b[1;34m(x, y)\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mdiv\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[1;32mreturn\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m/\u001b[0m\u001b[0my\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 3\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 4\u001b[0m \u001b[0mdiv\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
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"\u001b[1;31mZeroDivisionError\u001b[0m: integer division or modulo by zero"
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]
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}
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],
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"prompt_number": 4
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},
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{
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"cell_type": "code",
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"collapsed": false,
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"input": [
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"%debug"
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],
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"language": "python",
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"metadata": {},
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"outputs": [
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"> \u001b[1;32m<ipython-input-4-a5097cc0c0c5>\u001b[0m(2)\u001b[0;36mdiv\u001b[1;34m()\u001b[0m\n",
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"\u001b[1;32m 1 \u001b[1;33m\u001b[1;32mdef\u001b[0m \u001b[0mdiv\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mx\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0my\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
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"\u001b[0m\u001b[1;32m----> 2 \u001b[1;33m \u001b[1;32mreturn\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m/\u001b[0m\u001b[0my\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
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"\u001b[0m\u001b[1;32m 3 \u001b[1;33m\u001b[1;33m\u001b[0m\u001b[0m\n",
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"\u001b[0m\n"
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"ipdb> x\n"
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]
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},
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"1\n"
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"ipdb> y\n"
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]
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},
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{
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"0\n"
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]
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},
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{
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"name": "stdout",
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"output_type": "stream",
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"stream": "stdout",
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"text": [
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"ipdb> exit\n"
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]
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}
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],
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"prompt_number": 5
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}
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],
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"metadata": {}
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}
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]
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} |