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Welcome to Processing 3! Dan explains the new features and changes; the links Dan mentions are on the Vimeo page.

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Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology. There are tens of thousands of students, artists, designers, researchers, and hobbyists who use Processing for learning and prototyping.

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The second edition of Getting Started with Processing is here and it's updated for Processing 3. It's now in full color and there's a new chapter on working with data. The Processing Handbook now has a second edition too. Every chapter has been revised, and new chapters introduce more ways to work with data and geometry. New “synthesis” chapters offer discussions and worked examples of topics such as sketching with code, modularity, and algorithms.

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This document aims to give an overview of Windows-specific behaviour you shouldknow about when using Python on Microsoft Windows.

3.1. Installing Python¶

Unlike most Unix systems and services, Windows does not require Python nativelyand thus does not pre-install a version of Python. However, the CPython teamhas compiled Windows installers (MSI packages) with every release for many years.

With ongoing development of Python, some platforms that used to be supportedearlier are no longer supported (due to the lack of users or developers).Check PEP 11 for details on all unsupported platforms.

• Windows CE is still supported.
• The Cygwin installer offers to install the Pythoninterpreter as well; it is located under“Interpreters.” (cf. Cygwin package source, Maintainer releases)

See Python for Windowsfor detailed information about platforms with pre-compiled installers.

See also

Python on XP

“7 Minutes to “Hello World!””by Richard Dooling, 2006

Installing on Windows

in “Dive into Python: Python from novice to pro”by Mark Pilgrim, 2004,ISBN 1-59059-356-1

For Windows users

in “Installing Python”in “A Byte of Python”by Swaroop C H, 2003

3.2. Alternative bundles¶

Besides the standard CPython distribution, there are modified packages includingadditional functionality. The following is a list of popular versions and theirkey features:

ActivePython

Installer with multi-platform compatibility, documentation, PyWin32

Enthought Python Distribution

Popular modules (such as PyWin32) with their respective documentation, toolsuite for building extensible Python applications

Notice that these packages are likely to install older versions of Python.

3.3. Configuring Python¶

In order to run Python flawlessly, you might have to change certain environmentsettings in Windows.

3.3.1. Excursus: Setting environment variables¶

Windows has a built-in dialog for changing environment variables (followingguide applies to XP classical view): Right-click the icon for your machine(usually located on your Desktop and called “My Computer”) and chooseProperties there. Then, open the Advanced taband click the Environment Variables button.

In short, your path is:

In this dialog, you can add or modify User and System variables. To changeSystem variables, you need non-restricted access to your machine(i.e. Administrator rights).

Another way of adding variables to your environment is using the setcommand:

To make this setting permanent, you could add the corresponding command line toyour autoexec.bat. msconfig is a graphical interface to thisfile.

Viewing environment variables can also be done more straight-forward: Thecommand prompt will expand strings wrapped into percent signs automatically:

Consult set /? for details on this behaviour.

See also

http://support.microsoft.com/kb/100843

Environment variables in Windows NT

http://support.microsoft.com/kb/310519

How To Manage Environment Variables in Windows XP

http://www.chem.gla.ac.uk/~louis/software/faq/q1.html

Setting Environment variables, Louis J. Farrugia

3.3.2. Finding the Python executable¶

Besides using the automatically created start menu entry for the Pythoninterpreter, you might want to start Python in the command prompt. As ofPython 3.3, the installer has an option to set that up for you.

At the “Customize Python 3.3” screen, an option called“Add python.exe to search path” can be enabled to have the installer placeyour installation into the %PATH%. This allows you to typepython to run the interpreter. Thus, you can also execute yourscripts with command line options, see Command line documentation.

Traxxas 3.3 Start Drill

If you don’t enable this option at install time, you can always re-run theinstaller to choose it.

The alternative is manually modifying the %PATH% using thedirections in Excursus: Setting environment variables. You need to set your %PATH%environment variable to include the directory of your Python distribution,delimited by a semicolon from other entries. An example variable could looklike this (assuming the first two entries are Windows’ default):

3.3.3. Finding modules¶

Python usually stores its library (and thereby your site-packages folder) in theinstallation directory. So, if you had installed Python toC:Python, the default library would reside inC:PythonLib and third-party modules should be stored inC:PythonLibsite-packages.

This is how sys.path is populated on Windows:

• An empty entry is added at the start, which corresponds to the currentdirectory.
• If the environment variable PYTHONPATH exists, as described inEnvironment variables, its entries are added next. Note that on Windows,paths in this variable must be separated by semicolons, to distinguish themfrom the colon used in drive identifiers (C: etc.).
• Additional “application paths” can be added in the registry as subkeys ofSOFTWAREPythonPythonCoreversionPythonPath under both theHKEY_CURRENT_USER and HKEY_LOCAL_MACHINE hives. Subkeys which havesemicolon-delimited path strings as their default value will cause each pathto be added to sys.path. (Note that all known installers only useHKLM, so HKCU is typically empty.)
• If the environment variable PYTHONHOME is set, it is assumed as“Python Home”. Otherwise, the path of the main Python executable is used tolocate a “landmark file” (Libos.py) to deduce the “Python Home”. If aPython home is found, the relevant sub-directories added to sys.path(Lib, plat-win, etc) are based on that folder. Otherwise, the corePython path is constructed from the PythonPath stored in the registry.
• If the Python Home cannot be located, no PYTHONPATH is specified inthe environment, and no registry entries can be found, a default path withrelative entries is used (e.g. .Lib;.plat-win, etc).

The end result of all this is:

• When running python.exe, or any other .exe in the main Pythondirectory (either an installed version, or directly from the PCbuilddirectory), the core path is deduced, and the core paths in the registry areignored. Other “application paths” in the registry are always read.
• When Python is hosted in another .exe (different directory, embedded via COM,etc), the “Python Home” will not be deduced, so the core path from theregistry is used. Other “application paths” in the registry are always read.
• If Python can’t find its home and there is no registry (eg, frozen .exe, somevery strange installation setup) you get a path with some default, butrelative, paths.

3.3.4. Executing scripts¶

As of Python 3.3, Python includes a launcher which facilitates running Pythonscripts. See Python Launcher for Windows for more information.

3.3.5. Executing scripts without the Python launcher¶

Without the Python launcher installed, Python scripts (files with the extension.py) will be executed by python.exe by default. This executableopens a terminal, which stays open even if the program uses a GUI. If you donot want this to happen, use the extension .pyw which will cause the scriptto be executed by pythonw.exe by default (both executables arelocated in the top-level of your Python installation directory). Thissuppresses the terminal window on startup.

You can also make all .py scripts execute with pythonw.exe,setting this through the usual facilities, for example (might requireadministrative rights):

1. Launch a command prompt.

2. Associate the correct file group with .py scripts:

3. Redirect all Python files to the new executable:

3.4. Python Launcher for Windows¶

The Python launcher for Windows is a utility which aids in the location andexecution of different Python versions. It allows scripts (or thecommand-line) to indicate a preference for a specific Python version, andwill locate and execute that version.

3.4.1. Getting started¶

3.4.1.1. From the command-line¶

You should ensure the launcher is on your PATH - depending on how it wasinstalled it may already be there, but check just in case it is not.

From a command-prompt, execute the following command:

You should find that the latest version of Python 2.x you have installed isstarted - it can be exited as normal, and any additional command-linearguments specified will be sent directly to Python.

If you have multiple versions of Python 2.x installed (e.g., 2.6 and 2.7) youwill have noticed that Python 2.7 was started - to launch Python 2.6, try thecommand:

If you have a Python 3.x installed, try the command:

You should find the latest version of Python 3.x starts.

3.4.1.2. From a script¶

Let’s create a test Python script - create a file called hello.py with thefollowing contents

From the directory in which hello.py lives, execute the command:

You should notice the version number of your latest Python 2.x installationis printed. Now try changing the first line to be:

Re-executing the command should now print the latest Python 3.x information.As with the above command-line examples, you can specify a more explicitversion qualifier. Assuming you have Python 2.6 installed, try changing thefirst line to #!python2.6 and you should find the 2.6 versioninformation printed.

3.4.1.3. From file associations¶

The launcher should have been associated with Python files (i.e. .py,.pyw, .pyc, .pyo files) when it was installed. This means thatwhen you double-click on one of these files from Windows explorer the launcherwill be used, and therefore you can use the same facilities described above tohave the script specify the version which should be used.

The key benefit of this is that a single launcher can support multiple Pythonversions at the same time depending on the contents of the first line.

3.4.2. Shebang Lines¶

If the first line of a script file starts with #!, it is known as a“shebang” line. Linux and other Unix like operating systems have nativesupport for such lines and are commonly used on such systems to indicate howa script should be executed. This launcher allows the same facilities to beusing with Python scripts on Windows and the examples above demonstrate theiruse.

To allow shebang lines in Python scripts to be portable between Unix andWindows, this launcher supports a number of ‘virtual’ commands to specifywhich interpreter to use. The supported virtual commands are:

• /usr/bin/envpython
• /usr/bin/python
• /usr/local/bin/python
• python

For example, if the first line of your script starts with

The default Python will be located and used. As many Python scripts writtento work on Unix will already have this line, you should find these scripts canbe used by the launcher without modification. If you are writing a new scripton Windows which you hope will be useful on Unix, you should use one of theshebang lines starting with /usr.

3.4.3. Arguments in shebang lines¶

The shebang lines can also specify additional options to be passed to thePython interpreter. For example, if you have a shebang line:

Start 3.3 K

Then Python will be started with the -v option

3.4.4. Customization¶

3.4.4.1. Customization via INI files¶

Two .ini files will be searched by the launcher - py.ini in thecurrent user’s “application data” directory (i.e. the directory returnedby calling the Windows function SHGetFolderPath with CSIDL_LOCAL_APPDATA)and py.ini in the same directory as the launcher. The same .inifiles are used for both the ‘console’ version of the launcher (i.e.py.exe) and for the ‘windows’ version (i.e. pyw.exe)

Customization specified in the “application directory” will haveprecedence over the one next to the executable, so a user, who may nothave write access to the .ini file next to the launcher, can overridecommands in that global .ini file)

3.4.4.2. Customizing default Python versions¶

In some cases, a version qualifier can be included in a command to dictatewhich version of Python will be used by the command. A version qualifierstarts with a major version number and can optionally be followed by a period(‘.’) and a minor version specifier. If the minor qualifier is specified, itmay optionally be followed by “-32” to indicate the 32-bit implementation ofthat version be used.

For example, a shebang line of #!python has no version qualifier, while#!python3 has a version qualifier which specifies only a major version.

If no version qualifiers are found in a command, the environment variablePY_PYTHON can be set to specify the default version qualifier - the defaultvalue is “2”. Note this value could specify just a major version (e.g. “2”) ora major.minor qualifier (e.g. “2.6”), or even major.minor-32.

If no minor version qualifiers are found, the environment variablePY_PYTHON{major} (where {major} is the current major version qualifieras determined above) can be set to specify the full version. If no such optionis found, the launcher will enumerate the installed Python versions and usethe latest minor release found for the major version, which is likely,although not guaranteed, to be the most recently installed version in thatfamily.

On 64-bit Windows with both 32-bit and 64-bit implementations of the same(major.minor) Python version installed, the 64-bit version will always bepreferred. This will be true for both 32-bit and 64-bit implementations of thelauncher - a 32-bit launcher will prefer to execute a 64-bit Python installationof the specified version if available. This is so the behavior of the launchercan be predicted knowing only what versions are installed on the PC andwithout regard to the order in which they were installed (i.e., without knowingwhether a 32 or 64-bit version of Python and corresponding launcher wasinstalled last). As noted above, an optional “-32” suffix can be used on aversion specifier to change this behaviour.

Examples:

• If no relevant options are set, the commands python andpython2 will use the latest Python 2.x version installed andthe command python3 will use the latest Python 3.x installed.
• The commands python3.1 and python2.7 will not consult anyoptions at all as the versions are fully specified.
• If PY_PYTHON=3, the commands python and python3 will both usethe latest installed Python 3 version.
• If PY_PYTHON=3.1-32, the command python will use the 32-bitimplementation of 3.1 whereas the command python3 will use the latestinstalled Python (PY_PYTHON was not considered at all as a majorversion was specified.)
• If PY_PYTHON=3 and PY_PYTHON3=3.1, the commandspython and python3 will both use specifically 3.1

In addition to environment variables, the same settings can be configuredin the .INI file used by the launcher. The section in the INI file iscalled [defaults] and the key name will be the same as theenvironment variables without the leading PY_ prefix (and note thatthe key names in the INI file are case insensitive.) The contents ofan environment variable will override things specified in the INI file.

For example:

• Setting PY_PYTHON=3.1 is equivalent to the INI file containing:

• Setting PY_PYTHON=3 and PY_PYTHON3=3.1 is equivalent to the INI filecontaining:

3.4.5. Diagnostics¶

If an environment variable PYLAUNCH_DEBUG is set (to any value), thelauncher will print diagnostic information to stderr (i.e. to the console).While this information manages to be simultaneously verbose and terse, itshould allow you to see what versions of Python were located, why aparticular version was chosen and the exact command-line used to execute thetarget Python.

3.5. Additional modules¶

Even though Python aims to be portable among all platforms, there are featuresthat are unique to Windows. A couple of modules, both in the standard libraryand external, and snippets exist to use these features.

The Windows-specific standard modules are documented inMS Windows Specific Services.

3.5.1. PyWin32¶

The PyWin32 module by Mark Hammondis a collection of modules for advanced Windows-specific support. This includesutilities for:

• Component Object Model (COM)
• Win32 API calls
• Registry
• Event log
• Microsoft Foundation Classes (MFC)user interfaces

PythonWin is a sample MFC applicationshipped with PyWin32. It is an embeddable IDE with a built-in debugger.

See also

Win32 How Do I..?

by Tim Golden

Python and COM

by David and Paul Boddie

3.5.2. cx_Freeze¶

cx_Freeze is a distutilsextension (see Extending Distutils) which wraps Python scripts intoexecutable Windows programs (*.exe files). When you have done this,you can distribute your application without requiring your users to installPython.

3.5.3. WConio¶

Since Python’s advanced terminal handling layer, curses, is restricted toUnix-like systems, there is a library exclusive to Windows as well: WindowsConsole I/O for Python.

WConio is a wrapper forTurbo-C’s CONIO.H, used to create text user interfaces.

Start 3.3 Download

3.6. Compiling Python on Windows¶

If you want to compile CPython yourself, first thing you should do is get thesource. You can download either thelatest release’s source or just grab a fresh checkout.

The source tree contains a build solution and project files for MicrosoftVisual C++, which is the compiler used to build the official Python releases.View the readme.txt in their respective directories:

Note that any build directories within the PC directory are notnecessarily fully supported. The PCbuild directory contains the filesfor the compiler used to build the official release.

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Check PCbuild/readme.txt for general information on the build process.

For extension modules, consult Building C and C++ Extensions on Windows.

See also

By default the number of threads is based on the number of CPU cores. Added setting indexworkers to control the number of threads used for file indexing. This was occuring for some users upgrading from 3065.

Python + Windows + distutils + SWIG + gcc MinGW

or “Creating Python extensions in C/C++ with SWIG and compiling them withMinGW gcc under Windows” or “Installing Python extension with distutilsand without Microsoft Visual C++” by Sébastien Sauvage, 2003

MingW – Python extensions

by Trent Apted et al, 2007

3.7. Other resources¶

See also

Python Programming On Win32

“Help for Windows Programmers”by Mark Hammond and Andy Robinson, O’Reilly Media, 2000,ISBN 1-56592-621-8

A Python for Windows Tutorial

by Amanda Birmingham, 2004

PEP 397 - Python launcher for Windows

The proposal for the launcher to be included in the Python distribution.