Python IDLE: A Comprehensive Guide for Beginners

Python, a modern and versatile programming language, has gained immense popularity over the years. Whether you’re interested in web development, big data handling, machine learning, data science, or software development, Python has got you covered. As a beginner, learning Python is a great way to kickstart your programming journey. And to help you get started, Python comes bundled with a handy tool called IDLE. In this comprehensive guide, we will explore everything you need to know about Python IDLE, from installation to advanced features.

Table of Contents

  1. What is Python IDLE?
  2. Installing Python IDLE
  3. Working with Python IDLE
  4. Customizing Python IDLE
  5. Improving Your Workflow
  6. Debugging in IDLE
  7. Common Tasks in Python IDLE
  8. Tips and Tricks
  9. Frequently Asked Questions
  10. Conclusion

1. What is Python IDLE?

Python IDLE, short for Integrated Development and Learning Environment, is a bundled tool that comes with every Python installation. It serves as a beginner-friendly environment for writing, executing, and debugging Python code. While there are many Integrated Development Environments (IDEs) available for Python, IDLE stands out as a bare-bones tool that is perfect for those new to programming.

IDLE provides two main components: the Python shell and the code editor. The Python shell acts as an interactive interpreter, allowing you to run code snippets and experiment with Python directly. On the other hand, the code editor provides a more structured environment for writing and saving Python scripts. Additionally, IDLE offers a debugger to help you identify and fix errors in your code.

2. Installing Python IDLE

To get started with Python IDLE, you need to have Python installed on your computer. Follow these steps to install Python and IDLE:

  1. Visit the official Python website at
  2. Click on the “Download Python” button for the latest version.
  3. Choose the appropriate installer for your system (32-bit or 64-bit) based on your system specifications.

  1. Once the installer is downloaded, run it by double-clicking on the file.
  2. In the installer window, select the “Add Python to PATH” option and then click on “Install Now”.
  1. The installer will start installing Python on your system, which may take a few minutes to complete.
  2. After installation, you can check if Python is installed correctly by opening a command prompt (CMD) and typing “python –version” in the terminal. If Python is installed correctly, you will see the version of Python that has been installed.

3. Working with Python IDLE

Python Shell

The Python shell is the default mode of operation for Python IDLE. It provides an interactive environment where you can type Python code and see the results immediately. To launch the Python shell, simply open IDLE and you will see a blank interpreter window.

In the Python shell, you can execute Python statements one at a time. For example, you can use the print() function to output a message:

print("Hello, from IDLE!")

When you run this code in the Python shell (Press enter), it will display the output “Hello, from IDLE!”.

The Python shell also allows you to access previous statements and variables. You can use the up and down arrow keys to navigate through your command history. This feature can be helpful when you want to reuse or modify a previous statement.

Code Editor

The code editor in Python IDLE allows you to write and save Python scripts. To open a new file, go to the “File” menu and select “New File”. This will open a blank editor window where you can start writing your code.

The code editor provides several useful features to enhance your coding experience. It supports basic syntax highlighting, which colorizes different elements of your code to improve readability. The editor also offers code completion, which suggests completions for variables, functions, and modules as you type. Additionally, automatic indentation helps you maintain consistent code formatting by automatically adjusting the indentation level.

To run the code in the editor, go to the “Run” menu and select “Run Module” or press the F5 key. This will execute the entire script and display the output in the Python shell.


Python IDLE includes a built-in debugger that allows you to step through your code and identify and fix errors. The debugger helps you understand how your program is running and allows you to inspect variables and objects at different points in your code.

To use the debugger, go to the “Debug” menu and select “Debugger” or press the Ctrl+F5 key combination. This will start the debugger and open a separate debugger window. In the debugger window, you can set breakpoints, which are specific lines in your code where the debugger will pause execution. When the debugger reaches a breakpoint, it will pause and allow you to examine the state of your program.

4. Customizing Python IDLE

Python IDLE offers various customization options to tailor the environment to your preferences. You can modify the fonts, syntax highlighting, keyboard shortcuts, and more. Let’s explore some of the customization options available in Python IDLE.

Fonts and Tabs

The Fonts/Tabs settings in Python IDLE allow you to customize the appearance of the text editor. You can change the font, font size, and font style to suit your preferences. It is recommended to choose a fixed-width font like Courier New for better code readability.

In addition to font settings, you can also adjust the number of spaces used for indentation. By default, Python follows the PEP 8 style guide, which recommends using four spaces for indentation. However, you can change this value to match your preferred coding style.

Syntax Highlighting

Syntax highlighting is a feature that colorizes different elements of your code to improve readability. Python IDLE provides several built-in themes for syntax highlighting, including IDLE Day, IDLE Night, and IDLE New. You can select a theme that suits your preferences or create a custom theme.

To customize the syntax highlighting, go to the “Options” menu and select “Configure IDLE”. In the configuration window, navigate to the “Highlights” tab. From here, you can change the colors associated with different syntax elements, such as keywords, strings, and comments. Experiment with different colors until you find a combination that is visually appealing and easy to read.

Keyboard Shortcuts

Keyboard shortcuts are a great way to boost your productivity while coding. Python IDLE allows you to customize the default keyboard shortcuts or create your own. To modify the keyboard shortcuts, go to the “Options” menu and select “Configure IDLE”.

In the configuration window, navigate to the “Keys” tab. Here, you can see a list of pre-defined actions and their associated keyboard shortcuts. You can change the shortcuts by selecting an action and clicking the “Get New Keys for Selection” button. This will open a dialog where you can enter your desired key combination. Remember to choose key combinations that are not already assigned to other actions to avoid conflicts.

General Settings

The General settings tab in the configuration window allows you to make small adjustments to the Python IDLE environment. For example, you can specify the default window size and choose whether the shell or the editor opens first when you start Python IDLE.

Feel free to explore the various options in the General settings tab and customize Python IDLE according to your preferences.


Python IDLE supports extensions that can add new features and functionality to the environment. Although IDLE doesn’t have an extensive library of extensions, you can find several useful ones online.

To view the installed extensions, go to the “Options” menu and select “Configure IDLE”. In the configuration window, navigate to the “Extensions” tab. Here, you can see the list of installed extensions and manage them. If you find an extension that suits your needs, you can download it from a trusted source and install it in Python IDLE.

5. Improving Your Workflow

Python IDLE offers several features that can enhance your coding workflow and make you more productive. Let’s explore some of these features.

Automatic Indentation

Automatic indentation is a feature that automatically adds the correct level of indentation when you start a new block of code. In Python, indentation is significant and determines the structure of your code. Python IDLE takes care of indentation for you, making it easier to write clean and well-structured code.

When you type a colon (:) at the end of a line, Python IDLE automatically indents the next line for you. This helps you focus on writing the code instead of worrying about indentation. By following the recommended four-space indentation, you can ensure your code is consistent and easy to read.

Code Completion and Call Tips

Code completion is a powerful feature that saves you time by automatically suggesting completions as you type. Python IDLE offers basic code completion functionality, which can suggest names of functions, classes, and variables based on what you have typed so far. To use code completion, simply press the Tab key after typing a few characters.

Call tips are another helpful feature provided by Python IDLE. A call tip displays information about a specific function or method, helping you remember the required arguments and their order. When you open a parenthesis after a function name, Python IDLE will show a call tip after a short delay. This can be particularly useful when working with complex libraries or unfamiliar functions.

Code Context

Code context is a useful feature in Python IDLE that shows the scope of a function, class, loop, or other construct. It helps you understand the structure of your code and navigate through lengthy files more easily. When you enable code context, a gray bar appears at the top of the editor window, indicating the current context.

As you scroll through your code, the gray bar adjusts to show the context for each line. This helps you keep track of where you are in your code and identify the scope of different constructs. Code context is particularly helpful when reviewing or debugging code, as it provides a visual representation of the code’s structure.

6. Debugging in IDLE

Debugging is an essential skill for any programmer. Python IDLE comes with a built-in debugger that allows you to step through your code, inspect variables, and identify and fix errors. Let’s explore how to use the debugger in Python IDLE.

As an example we will use this code from The Department of Computer Science at the University of Kentucky – debug-tutorial

##  volume calculations with torus
# Author:
# Date:
# There are libraries of common functions, for example a math library
# that has functions such as sine, cosine, logs, etc.
# There ARE syntax and semantic errors in this program as given!
from math import pi   # use the value of pi defined in the math library
def main():
      radius = input("Enter the radius: ")
      height = input("Enter the height: ")
      conevol = 1/3*pi*radius*2*height   # cone volume
      cylvol = pi*radius**2*height        # cylinder volume
      spherevol = 3/4*Pi*r**3        # sphere volume
      print ('The volume of a cone: ',conevol)
      print ("The volume of a cylinder: ",cylvol)
      print ("The volume of a sphere: ",spherevol)


Using the Debugger

To use the debugger in Python IDLE, go to the “Debug” menu and select “Debugger” or press the Ctrl+F5 key combination. This will open the debugger window and start the debugger.

The debugger window provides various controls and information to help you navigate through your code. You can use the following buttons to control the execution of your code:

  • Go: Advancing execution to the next breakpoint.
  • Step: Executing the current line and moving to the next one.
  • Over: Stepping over a function call without pausing inside the function.
  • Out: Stepping out of the current function and continuing execution.

In addition to the control buttons, the debugger window displays the values of variables and objects at each step of execution. This allows you to inspect the state of your program and identify any issues.

Setting Breakpoints

Breakpoints are specific lines in your code where the debugger will pause execution. By setting breakpoints, you can examine the state of your program at different points and identify the cause of any issues.

To set a breakpoint, right-click on the line of code where you want to pause execution and select “Set Breakpoint” from the context menu. The line will be highlighted to indicate that a breakpoint has been set. You can set multiple breakpoints throughout your code to focus on specific areas of interest.

Handling Errors and Exceptions

Python IDLE provides tools to help you handle errors and exceptions in your code. When an error occurs, Python IDLE displays a traceback message that shows the sequence of function calls leading to the error. This can help you pinpoint the source of the error and understand its context.

To navigate to the line of code causing the error, you can simply click on the line number in the traceback message. Python IDLE will open the file containing the error and highlight the problematic line. This makes it easy to locate and fix errors in your code.

7. Common Tasks in Python IDLE

Python IDLE offers several features and tools to perform common tasks in Python development. Let’s explore some of these tasks and how to accomplish them using Python IDLE.

Creating and Running Python Files

To create a new Python file in Python IDLE, go to the “File” menu and select “New File”. This will open a blank editor window where you can start writing your Python code. Once you have written your code, save the file with a .py extension.

To run a Python file in Python IDLE, go to the “Run” menu and select “Run Module” or press the F5 key. Python IDLE will execute the entire script and display the output in the Python shell.

Exploring Python Modules

Python IDLE provides a module browser that allows you to explore the modules installed on your system. To access the module browser, go to the “File” menu and select “Path Browser”. This will open a window showing the modules available in your Python installation.

You can double-click on a module to view its source code in the code editor. This can be useful when you want to understand how a specific module works or when you need to reference its documentation.

Inspecting Variables and Objects

Python IDLE provides a simple way to inspect variables and objects while your code is running. To inspect a variable, you can simply type its name in the Python shell or the code editor and press Enter. Python IDLE will display the current value of the variable.

If you want to inspect an object in more detail, you can use the built-in dir() function. By calling dir(object), Python IDLE will show you a list of attributes and methods available for that object. This can help you understand the properties and behavior of the object.

8. Tips and Tricks

To make the most of Python IDLE, here are some tips and tricks that can improve your experience and productivity.

Multi-Window Mode

By default, Python IDLE opens in single-window mode, where the shell, editor, and debugger are combined in one interface. However, you can switch to multi-window mode, which separates each component into its own window. This can be helpful if you prefer to have multiple windows open simultaneously.

To enable multi-window mode, go to the “Options” menu and select “Multi-window mode”. Python IDLE will restart in multi-window mode, and you can arrange the windows according to your preferences.

Using IDLE in Command Line

Python IDLE can also be used from the command line, allowing you to run IDLE without the graphical interface. This can be useful if you prefer a command-line environment or if you’re working on a remote server.

To launch IDLE from the command line, simply type idle and press Enter. This will open IDLE in the command-line interface, where you can use the Python shell and code editor as usual.

IDLE as a Learning Tool

Python IDLE is not only a powerful tool for professional development but also a valuable resource for learning Python. Its simplicity and integrated features make it an ideal environment for beginners to experiment and practice coding.

As you learn Python, try using IDLE to test out new concepts and code snippets. The interactive Python shell allows you to see immediate results and understand how different statements and functions work. The code editor helps you write and save Python scripts, allowing you to build more complex programs.

9. Frequently Asked Questions

How do I update Python IDLE?

To update Python IDLE, you need to update your Python installation to the latest version. Visit the official Python website at and download the latest installer. Run the installer and follow the on-screen instructions to update Python and IDLE.

Can I use Python IDLE on Linux?

Yes, Python IDLE is available for Linux. You can install IDLE using your package manager. For example, on Ubuntu, you can use the following command to install IDLE:

sudo apt-get install idle

Is IDLE suitable for professional development?

While Python IDLE is a great tool for beginners and small projects, it may not be as feature-rich as some professional IDEs. Professional developers often prefer more advanced IDEs, such as PyCharm or Visual Studio Code, which offer advanced features like integrated debugging, version control, and code refactoring tools. Here’s a guide on how to install pycharm great for developing bigger projects from github!

However, IDLE can still be a useful tool for quick prototyping and simple projects.

10. Conclusion

In this comprehensive guide, we have explored Python IDLE and its various features. From installation to customization, debugging, and common tasks, Python IDLE provides a user-friendly environment for Python development. Whether you’re a beginner learning Python or an experienced developer looking for a lightweight IDE, Python IDLE has got you covered. So, go ahead and start coding with Python IDLE!

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