##// END OF EJS Templates
Don't add ipython unconditionally to sys.path...
Don't add ipython unconditionally to sys.path Load ext will already do it with a context manager. This should remove false positive when import modules, whithout breaking functionalities. Maybe closes #13294 (making this part of 8.0 release make sens).

File last commit:

r24322:1e1a3cd0
r27190:575be23d
Show More
Script Magics.ipynb
466 lines | 9.1 KiB | text/plain | TextLexer
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "cells": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "cell_type": "markdown",
"metadata": {},
"source": [
"# Running Scripts from IPython"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"IPython has a `%%script` cell magic, which lets you run a cell in\n",
"a subprocess of any interpreter on your system, such as: bash, ruby, perl, zsh, R, etc.\n",
"\n",
"It can even be a script of your own, which expects input on stdin."
]
},
{
"cell_type": "code",
"execution_count": 1,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"import sys"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Basic usage"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"To use it, simply pass a path or shell command to the program you want to run on the `%%script` line,\n",
"and the rest of the cell will be run by that script, and stdout/err from the subprocess are captured and displayed."
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
Min RK
pass on IPython Kernel example notebooks...
r20547 "hello from Python 2.7.9 (default, Jan 29 2015, 06:27:40) \n",
"[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.56)]\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
Min RK
pass on IPython Kernel example notebooks...
r20547 "%%script python2\n",
Min RK
upate exmaple notebooks to nbformat v4
r18669 "import sys\n",
"print 'hello from Python %s' % sys.version"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
Min RK
pass on IPython Kernel example notebooks...
r20547 "hello from Python: 3.4.2 |Continuum Analytics, Inc.| (default, Oct 21 2014, 17:42:20) \n",
"[GCC 4.2.1 (Apple Inc. build 5577)]\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%script python3\n",
"import sys\n",
"print('hello from Python: %s' % sys.version)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"IPython also creates aliases for a few common interpreters, such as bash, ruby, perl, etc.\n",
"\n",
"These are all equivalent to `%%script <name>`"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
Brian Granger
More changes to example notebooks.
r9193 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
Min RK
pass on IPython Kernel example notebooks...
r20547 "Hello from Ruby 2.0.0\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%ruby\n",
"puts \"Hello from Ruby #{RUBY_VERSION}\""
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"hello from /usr/local/bin/bash\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%bash\n",
"echo \"hello from $BASH\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Capturing output"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"You can also capture stdout/err from these subprocesses into Python variables, instead of letting them go directly to stdout/err"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"hi, stdout\n"
MinRK
add Script Magics demo notebook
r7402 ]
},
{
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stderr",
"output_type": "stream",
"text": [
"hello, stderr\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%bash\n",
"echo \"hi, stdout\"\n",
"echo \"hello, stderr\" >&2\n"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"%%bash --out output --err error\n",
"echo \"hi, stdout\"\n",
"echo \"hello, stderr\" >&2"
]
},
{
"cell_type": "code",
"execution_count": 8,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"hello, stderr\n",
MinRK
rebuild example notebooks...
r7739 "\n",
Min RK
upate exmaple notebooks to nbformat v4
r18669 "hi, stdout\n",
"\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"print(error)\n",
"print(output)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Background Scripts"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"These scripts can be run in the background, by adding the `--bg` flag.\n",
"\n",
"When you do this, output is discarded unless you use the `--out/err`\n",
"flags to store output as above."
]
},
{
"cell_type": "code",
"execution_count": 9,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"Starting job # 0 in a separate thread.\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%ruby --bg --out ruby_lines\n",
"for n in 1...10\n",
" sleep 1\n",
" puts \"line #{n}\"\n",
" STDOUT.flush\n",
"end"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"When you do store output of a background thread, these are the stdout/err *pipes*,\n",
"rather than the text of the output."
]
},
{
"cell_type": "code",
"execution_count": 10,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "data": {
"text/plain": [
"<open file '<fdopen>', mode 'rb' at 0x10a4be660>"
]
},
"execution_count": 10,
MinRK
rebuild example notebooks...
r7739 "metadata": {},
Min RK
upate exmaple notebooks to nbformat v4
r18669 "output_type": "execute_result"
}
],
"source": [
"ruby_lines"
]
},
{
"cell_type": "code",
"execution_count": 11,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
MinRK
rebuild example notebooks...
r7739 "line 1\n",
"line 2\n",
"line 3\n",
"line 4\n",
Min RK
upate exmaple notebooks to nbformat v4
r18669 "line 5\n",
"line 6\n",
"line 7\n",
"line 8\n",
"line 9\n",
"\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"print(ruby_lines.read())"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Arguments to subcommand"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"You can pass arguments the subcommand as well,\n",
"such as this example instructing Python to use integer division from Python 3:"
]
},
{
"cell_type": "code",
"execution_count": 12,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"0.333333333333\n"
]
}
],
"source": [
Min RK
pass on IPython Kernel example notebooks...
r20547 "%%script python2 -Qnew\n",
Min RK
upate exmaple notebooks to nbformat v4
r18669 "print 1/3"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"You can really specify *any* program for `%%script`,\n",
"for instance here is a 'program' that echos the lines of stdin, with delays between each line."
]
},
{
"cell_type": "code",
"execution_count": 13,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"Starting job # 2 in a separate thread.\n"
MinRK
add Script Magics demo notebook
r7402 ]
Min RK
upate exmaple notebooks to nbformat v4
r18669 }
],
"source": [
"%%script --bg --out bashout bash -c \"while read line; do echo $line; sleep 1; done\"\n",
"line 1\n",
"line 2\n",
"line 3\n",
"line 4\n",
"line 5\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Remember, since the output of a background script is just the stdout pipe,\n",
"you can read it as lines become available:"
]
},
{
"cell_type": "code",
"execution_count": 14,
"metadata": {
"collapsed": false
},
"outputs": [
MinRK
add Script Magics demo notebook
r7402 {
Min RK
upate exmaple notebooks to nbformat v4
r18669 "name": "stdout",
"output_type": "stream",
"text": [
"0.0s: line 1\n",
"1.0s: line 2\n",
"2.0s: line 3\n",
"3.0s: line 4\n",
"4.0s: line 5\n"
MinRK
add Script Magics demo notebook
r7402 ]
}
MinRK
rebuild example notebooks...
r7739 ],
Min RK
upate exmaple notebooks to nbformat v4
r18669 "source": [
"import time\n",
"tic = time.time()\n",
"line = True\n",
"while True:\n",
" line = bashout.readline()\n",
" if not line:\n",
" break\n",
" sys.stdout.write(\"%.1fs: %s\" %(time.time()-tic, line))\n",
" sys.stdout.flush()\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Configuring the default ScriptMagics"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"The list of aliased script magics is configurable.\n",
"\n",
"The default is to pick from a few common interpreters, and use them if found, but you can specify your own in ipython_config.py:\n",
"\n",
" c.ScriptMagics.scripts = ['R', 'pypy', 'myprogram']\n",
"\n",
luz.paz
Fix documentation typos...
r24322 "And if any of these programs do not appear on your default PATH, then you would also need to specify their location with:\n",
Min RK
upate exmaple notebooks to nbformat v4
r18669 "\n",
" c.ScriptMagics.script_paths = {'myprogram': '/opt/path/to/myprogram'}"
]
MinRK
add Script Magics demo notebook
r7402 }
Min RK
upate exmaple notebooks to nbformat v4
r18669 ],
Min RK
add kernel metadata to example notebooks
r20278 "metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.4.2"
}
},
Min RK
upate exmaple notebooks to nbformat v4
r18669 "nbformat": 4,
"nbformat_minor": 0
Min RK
add kernel metadata to example notebooks
r20278 }