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25.5. IDLE — Python v2.6.2 documentation

25.5. IDLE¶

IDLE is the Python IDE built with the tkinter GUI toolkit.

IDLE has the following features:

  • coded in 100% pure Python, using the tkinter GUI toolkit
  • cross-platform: works on Windows and Unix
  • multi-window text editor with multiple undo, Python colorizing and many other features, e.g. smart indent and call tips
  • Python shell window (a.k.a. interactive interpreter)
  • debugger (not complete, but you can set breakpoints, view and step)

25.5.2. Basic editing and navigation¶

  • Backspace deletes to the left; Del deletes to the right
  • Arrow keys and Page Up/Page Down to move around
  • Home/End go to begin/end of line
  • C-Home/C-End go to begin/end of file
  • Some Emacs bindings may also work, including C-B, C-P, C-A, C-E, C-D, C-L Automatic indentation¶

After a block-opening statement, the next line is indented by 4 spaces (in the Python Shell window by one tab). After certain keywords (break, return etc.) the next line is dedented. In leading indentation, Backspace deletes up to 4 spaces if they are there. Tab inserts 1-4 spaces (in the Python Shell window one tab). See also the indent/dedent region commands in the edit menu. Python Shell window¶

  • C-C interrupts executing command
  • C-D sends end-of-file; closes window if typed at a >>> prompt
  • Alt-p retrieves previous command matching what you have typed
  • Alt-n retrieves next
  • Return while on any previous command retrieves that command
  • Alt-/ (Expand word) is also useful here

25.5.3. Syntax colors¶

The coloring is applied in a background “thread,” so you may occasionally see uncolorized text. To change the color scheme, edit the [Colors] section in config.txt.

Python syntax colors:
Shell colors:
Console output
dark green

25.5.4. Startup¶

Upon startup with the -s option, IDLE will execute the file referenced by the environment variables IDLESTARTUP or PYTHONSTARTUP. Idle first checks for IDLESTARTUP; if IDLESTARTUP is present the file referenced is run. If IDLESTARTUP is not present, Idle checks for PYTHONSTARTUP. Files referenced by these environment variables are convenient places to store functions that are used frequently from the Idle shell, or for executing import statements to import common modules.

In addition, Tk also loads a startup file if it is present. Note that the Tk file is loaded unconditionally. This additional file is .Idle.py and is looked for in the user’s home directory. Statements in this file will be executed in the Tk namespace, so this file is not useful for importing functions to be used from Idle’s Python shell. Command line usage¶

idle.py [-c command] [-d] [-e] [-s] [-t title] [arg] ...

-c command  run this command
-d          enable debugger
-e          edit mode; arguments are files to be edited
-s          run $IDLESTARTUP or $PYTHONSTARTUP first
-t title    set title of shell window

If there are arguments:

  1. If -e is used, arguments are files opened for editing and sys.argv reflects the arguments passed to IDLE itself.
  2. Otherwise, if -c is used, all arguments are placed in sys.argv[1:...], with sys.argv[0] set to '-c'.
  3. Otherwise, if neither -e nor -c is used, the first argument is a script which is executed with the remaining arguments in sys.argv[1:...] and sys.argv[0] set to the script name. If the script name is ‘-‘, no script is executed but an interactive Python session is started; the arguments are still available in sys.argv.
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