How to implement tooltip using Tkinter Python
*Title: Handling Keyboard Events in a Tkinter GUI Application*
*Description:*
This Python script demonstrates how to handle keyboard events in a Tkinter-based GUI application. The program listens for key presses and releases, displaying the key's symbol in the console when an event occurs. Additionally, it includes a specific event handler for the "Escape" key, which closes the application when pressed. The Tkinter window is initialized with a title and a predefined size. This example is useful for learning how to capture and respond to user keyboard inputs within a graphical interface.
*Code Explanation:*
1. *Importing Tkinter:*
```python
import tkinter as tk
```
The script starts by importing the `tkinter` module, which is the standard Python interface to create GUI applications.
2. *Defining the Event Handlers:*
*`on_key_press(event)`:* This function is triggered whenever a key is pressed. It takes an `event` object as an argument and prints the name of the key pressed using `event.keysym`.
*`on_key_release(event)`:* This function is called when a key is released. Similar to `on_key_press`, it prints the name of the released key.
*`on_escape_press(event)`:* This function specifically handles the "Escape" key. When the "Escape" key is pressed, it prints a message and closes the application by calling `root.destroy()`.
3. *Creating the Main Application Window:*
```python
root = tk.Tk()
root.title("Keyboard Events Example")
root.geometry("400x300")
```
Here, a Tkinter root window is created with the title "Keyboard Events Example" and a fixed size of 400x300 pixels.
4. *Binding Keyboard Events to Handlers:*
```python
root.bind("KeyPress", on_key_press)
root.bind("KeyRelease", on_key_release)
root.bind("Escape", on_escape_press)
```
The `bind` method is used to link specific keyboard events to the corresponding functions:
`KeyPress` is bound to `on_key_press`, so any key press will trigger this function.
`KeyRelease` is bound to `on_key_release`, so any key release will trigger this function.
`Escape` is bound to `on_escape_press`, which will close the application when the "Escape" key is pressed.
5. *Running the Application Loop:*
```python
root.mainloop()
```
Finally, the `mainloop()` method is called to start the Tkinter event loop, keeping the application window open and responsive to user interactions.
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