Show completions. B uild. Run the program. Check module. Comment region. Uncomment region. Tabify region. Untabify region. Toggle auto coloring. T oggle tabs. IDLE is an integrated development environment for Python. It is bundled with default implementation of the language and completely written in Python. Web page: python. Other languages: Turkish French. Do you have any useful tips for it? Let other users know below.
You will then get the following message to save your code:. Choose a location where the Python file will be saved on your computer. Here are the steps that you may follow. Steps to Download and Install Python 3. By default, IDLE runs user code in a separate OS process rather than in the user interface process that runs the shell and editor.
In the execution process, it replaces sys. The original values stored in sys. Sending print output from one process to a text widget in another is slower than printing to a system terminal in the same process. This has the most effect when printing multiple arguments, as the string for each argument, each separator, the newline are sent separately.
For development, this is usually not a problem, but if one wants to print faster in IDLE, format and join together everything one wants displayed together and then print a single string. Both format strings and str. If such subprocess use input from sys. The secondary subprocess will then be attached to that window for input and output. If sys is reset by user code, such as with importlib. When Shell has the focus, it controls the keyboard and screen.
This is normally transparent, but functions that directly access the keyboard and screen will not work. These include system-specific functions that determine whether a key has been pressed and if so, which. The IDLE code running in the execution process adds frames to the call stack that would not be there otherwise. IDLE wraps sys. When user code raises SystemExit either directly or by calling sys. When a program outputs text, the result is determined by the corresponding output device.
When IDLE executes user code, sys. Some of its features are inherited from the underlying Tk Text widget. Others are programmed additions. Where it matters, Shell is designed for development rather than production runs. For instance, Shell never throws away output. A program that sends unlimited output to Shell will eventually fill memory, resulting in a memory error.
In contrast, some system text windows only keep the last n lines of output. A Windows console, for instance, keeps a user-settable 1 to lines, with the default. Which characters are displayed with a proper glyph and which with a replacement box depends on the operating system and installed fonts.
Tab characters cause the following text to begin after the next tab stop. Newline characters cause following text to appear on a new line. Other control characters are ignored or displayed as a space, box, or something else, depending on the operating system and font. Moving the text cursor through such output with arrow keys may exhibit some surprising spacing behavior.
The repr function is used for interactive echo of expression values. It returns an altered version of the input string in which control codes, some BMP codepoints, and all non-BMP codepoints are replaced with escape codes. As demonstrated above, it allows one to identify the characters in a string, regardless of how they are displayed.
Normal and error output are generally kept separate on separate lines from code input and each other. They each get different highlight colors. When code run from a file causes other exceptions, one may right click on a traceback line to jump to the corresponding line in an IDLE editor.
The file will be opened if necessary. N can be changed in the PyShell section of the General page of the Settings dialog. Output with fewer lines can be squeezed by right clicking on the output. This can be useful lines long enough to slow down scrolling. Squeezed output is expanded in place by double-clicking the label. It can also be sent to the clipboard or a separate view window by right-clicking the label.
IDLE is intentionally different from standard Python in order to facilitate development of tkinter programs. Tk in standard Python and nothing appears. Enter the same in IDLE and a tk window appears. In standard Python, one must also enter root. IDLE does the equivalent in the background, about 20 times a second, which is about every 50 milliseconds. Again, nothing visibly changes in standard Python until one enters root.
Most tkinter programs run root. When running a tkinter program from an IDLE editor, one can comment out the mainloop call. One then gets a shell prompt immediately and can interact with the live application. One just has to remember to re-enable the mainloop call when running in standard Python. By default, IDLE executes user code in a separate subprocess via a socket, which uses the internal loopback interface. This connection is not externally visible and no data is sent to or received from the internet.
If firewall software complains anyway, you can ignore it. If the attempt to make the socket connection fails, Idle will notify you. Such failures are sometimes transient, but if persistent, the problem may be either a firewall blocking the connection or misconfiguration of a particular system. Until the problem is fixed, one can run Idle with the -n command line switch.
If IDLE is started with the -n command line switch it will run in a single process and will not create the subprocess which runs the RPC Python execution server.
This can be useful if Python cannot create the subprocess or the RPC socket interface on your platform. However, in this mode user code is not isolated from IDLE itself.
If your code has been modified, you must reload the affected modules and re-import any specific items e. For these reasons, it is preferable to run IDLE with the default subprocess if at all possible. The result, in a read-only tkinter text window, is close to what one sees in a web browser. Navigate through the text with a mousewheel, the scrollbar, or up and down arrow keys held down. If your system has an off-line copy of the docs this may be an installation option , that will be opened instead.
The font preferences, highlighting, keys, and general preferences can be changed via Configure IDLE on the Option menu. Non-default user settings are saved in a.
Problems caused by bad user configuration files are solved by editing or deleting one or more of the files in. On the Font tab, see the text sample for the effect of font face and size on multiple characters in multiple languages. Edit the sample to add other characters of personal interest. Use the sample to select monospaced fonts. If particular characters have problems in Shell or an editor, add them to the top of the sample and try changing first size and then font.
On the Highlights and Keys tab, select a built-in or custom color theme and key set. IDLE contains an extension facility. Preferences for extensions can be changed with the Extensions tab of the preferences dialog.
See the beginning of config-extensions. The only current default extension is zzdummy, an example also used for testing. Navigation index modules next previous Python ». Open… Open an existing file with an Open dialog. Recent Files Open a list of recent files.
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