CSE 142: Computer Programming I, Autumn 2007 |
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Like Java, you will need at most only two pieces of software: the Python environment and some text editor. Depending on your operating system, you'll use different instructions to install Python.
Windows
Mac OSX
Linux
If you encounter problems trying to set up Python, contact Scott (tannewt AT cs.washington.edu) or Ian Gienger (igienger AT cs.washington.edu) for help and suggestions.
Windows does not come with Python pre-installed, so you will have to download and install it.
Step 1. Install Python
Python v2.5.1 InstallerClick the link above to download the Python installer. Once downloaded, run the program to install Python.
Step 2. Install TextPad (Optional)
TextPad DownloadAfter installing Python, you will have a basic editor called IDLE. However, you can install a nicer editor instead; we suggest TextPad. Download TextPad from the link above and install it.
Step 3. Configure TextPad (Optional)
Python Syntax for TextPadNext, download the Python Syntax .zip file and extract the contents into the "Samples" folder in your TextPad installation directory. For example, if you installed into
C:\Program Files\TextPad\, extract the contents intoC:\Program Files\TextPad\Samples. Next, open TextPad and run "Configure -> New Document Class...". For the "Document Class Name", enterPythonand click Next. For "Class Names" enter*.pyand click Next. Check "Enable Highlighting" and choosePythonV2.4.synfrom the dropdown list, then click Next and Finish.After that, run "Configure -> Preferences" and do the following:
Click OK and you're done!
- 1) Under "File", delete
txtfrom the "Default file extension" (Screenshot)- 2) Under "Python -> Tabulation", change "Default tab spacing" and "Indent size" to 4 (Screenshot)
- 3) Under "Tools", click "Add -> DOS Command" and type
C:\INSTALL_DIRECTORY\python.exe $File. For example, if you installed Python intoC:\Python25, then typeC:\Python25\python.exe $Fileand click Apply (Screenshot)- 4) Under "Tools -> C:\INSTALL_DIRECTORY\python.exe $File", uncheck "Capture Output" (Screenshot)
Step 4. Using Your Editor
TextPad
To use TextPad, make sure you have an empty document; create a new one if necessary (CTRL+N). Next, save your empty document (CTRL+SHIFT+S) as a *.py file -- for example, "greeneggs.py". Now you can type your Python code as usual with syntax highlighting.
To run your Python code, go to "Tools -> External Tools -> ...\python.exe $File" (or press CTRL+1) and the output will be displayed in a DOS window.
IDLE
IDLE is an interpreter/editor combo called found under "Start -> Programs -> Python 2.5 -> IDLE". To create a new Python script, go to "File -> New Window" (CTRL+N). Here you can type out your Python code, save it, and then run it by selecting "Run -> Run Module" (F5). A small benefit of the IDLE environment is that you can test Python commands in the Python Shell window ("Run -> Python Shell"), which contains the Python interactive interpreter.
Step 5. Using the Python Interpreter
To use the Python interpreter alone, run "Start -> Programs -> Python 2.5 -> Python (Command Line)". Here you can type Python commands into the window interactively.
Useful Extras
To enable the command
pythonfrom the command line, follow these steps.
- 1) Right-click "My Computer" and select "Properties"
- 2) Choose the "Advanced" tab (Screenshot)
- 3) Click on "Environment Variables" (Screenshot)
- 4) If making this change for one user only, either "Edit" or create the "PATH" variable under the "User variables" section. If it already exists, append
;C:\Python25(changing;C:\Python25to whatever your installation directory is). If it doesn't already exist, type in%PATH%;C:\Python25, once again substituting your installation directory (Screenshot)- 5) If making this change systemwide, "Edit" the "PATH" variable under the "System variables" section. Append
;C:\Python25to the end, substituting your Python installation directory- 6) Exit out, saving your changes
Luckily, Python comes pre-installed on Macs. However, it doesn't come bundled with an editor, so we recommend installing Smultron, a text editor.
Step 1. Install Smultron
Smultron HomepageFirst, go to the Smultron Homepage and download the Latest Version from the Download section in the top right.
Step 2. Configure Smultron for Python
Although Smultron will work fine without configuration, a single configuration option will make life a little easier.
Go to "Tools -> Handle Commands -> Show Commands Window" (⌘B) and select "Other" under the Collections column. Next, click "New Command" in the top right. For a name, put "Run Python Script". In the box below, type
/usr/bin/env python %%p. Optionally, double-click the shortcut field to create a shortcut to run your script. If everything was done correctly, it should look like this screenshot.Step 3. Using Your Editor
Smultron is easy to use. First, create a new document (⌘N). Next, save your empty document (⌘S) as a .py file -- for example, "greeneggs.py". Finally, type your Python code as you normally would and it will show up with syntax highlighting.
To run your Python code, select "Tools -> Commands -> Other -> Run Python Script", or optionally use your shortcut keybind if you made one in the previous step.
Step 4. Using the Python Interpreter
To use the Python Interpreter, open Terminal and type
pythonto start it. Terminal is located in "Applications -> Utilities -> Terminal".
Chances are, if you're using a Linux distribution you probably have Python already. To check, open a Terminal (aka Command Line) and type python
. If you already have Python installed, this will pull up a Python Interpreter; otherwise, follow the instructions to get Python on this page.