Denis Akhiyarov den-run-ai

Previous versions used homebrew to install the various versions. As suggested in the comments, it's better to use pyenv instead. If you are looking for the previous version of this document, see the revision history.

$ brew update
$ brew install pyenv
$ pyenv install 3.5.0
$ pyenv install 3.4.3
$ pyenv install 3.3.6
$ pyenv install 3.2.6
$ pyenv install 2.7.10

$ pyenv install 2.6.9

Easy parallel python with concurrent.futures

As of version 3.3, python includes the very promising concurrent.futures module, with elegant context managers for running tasks concurrently. Thanks to the simple and consistent interface you can use both threads and processes with minimal effort.

For most CPU bound tasks - anything that is heavy number crunching - you want your program to use all the CPUs in your PC. The simplest way to get a CPU bound task to run in parallel is to use the ProcessPoolExecutor, which will create enough sub-processes to keep all your CPUs busy.

We use the context manager thusly:

with concurrent.futures.ProcessPoolExecutor() as executor:

if you are using linux, unix, os x:

pip install -U setuptools
pip install -U pip

pip install numpy
pip install scipy
pip install matplotlib
#pip install PySide

	##############################################################################
	#
	# Simple Python program to benchmark several Python Excel writing modules.
	#
	# python bench_excel_writers.py [num_rows] [num_cols]
	#
	#

	import sys
	from time import clock

	#include <memory>
	#include <random>
	#include <chrono>
	#include <algorithm>
	#include <iostream>

	#include <gflags/gflags.h>
	#include <boost/chrono/chrono.hpp>
	#include <boost/chrono/duration.hpp>
	#include <boost/chrono/process_cpu_clocks.hpp>

	import os
	import pyHook
	import pythoncom
	import threading

	# Requires pyHook: http://sourceforge.net/apps/mediawiki/pyhook/
	# Requires pyWin32: http://sourceforge.net/projects/pywin32/

	# Kills the process if escape is pressed
	class EscapeToKill(threading.Thread):

	@echo off
	:: Path to Sublime Text installation dir.
	SET stPath=%~dp0sublime_text.exe
	SET stPathOnly=%~dp0
	:: Key name for the registry entries.
	SET UserEntry=Sublime Text
	SET AdminEntry=Sublime Text As Admin
	:: Context menu texts.
	SET "UserMenuText=Open with Sublime(&-)"
	SET "AdminMenuText=Open with Sublime As Admin(&+)"

	# +-----------------------------------------------------------------------------+
	# \| Copyright (C) 2011-2015 \|
	# \| Original by Marcel Loose (loose <at> astron.nl) 2011-2013 \|
	# \| Modified by Chris Kerr (chris.kerr <at> mykolab.ch) 2013-2015 \|
	# \| \|
	# \| This program is free software; you can redistribute it and/or modify \|
	# \| it under the terms of the GNU General Public License as published by \|
	# \| the Free Software Foundation; either version 2 of the License, or \|
	# \| (at your option) any later version. \|
	# \| \|

	#!/usr/bin/env python
	"""strip outputs from an IPython Notebook

	Opens a notebook, strips its output, and writes the outputless version to the original file.

	Useful mainly as a git filter or pre-commit hook for users who don't want to track output in VCS.

	This does mostly the same thing as the `Clear All Output` command in the notebook UI.

	LICENSE: Public Domain