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Articles on Trending Technologies
Technical articles with clear explanations and examples
Program to merge strings alternately using Python
Suppose we have two strings s and t. We have to merge them by adding letters in alternating fashion, starting from s. If s and t are not of same length, add the extra letters onto the end of the merged string. So, if the input is like s = "major" and t = "general", then the output will be "mgaejnoerral". Since t is larger than s, we have added extra part "ral" at the end. Algorithm To solve this, we will follow these steps − Initialize i := j := 0 ...
Read MoreProgram to find longest nice substring using Python
A nice substring is one where every letter appears in both uppercase and lowercase. For example, "bBb" is nice because 'b' appears as both 'b' and 'B'. This tutorial shows how to find the longest nice substring in Python. Problem Understanding Given a string, we need to find the longest substring where every letter appears in both uppercase and lowercase forms. If multiple substrings have the same maximum length, return the one that appears first. Algorithm Approach We'll use a nested loop approach to check all possible substrings: For each starting position, build a ...
Read MoreProgram to find largest perimeter triangle using Python
Suppose we have an array nums of positive lengths, we have to find the largest perimeter of a triangle by taking three values from that array. When it is impossible to form any triangle of non-zero area, then return 0. So, if the input is like [8, 3, 6, 4, 2, 5], then the output will be 19. Triangle Inequality Rule For three sides to form a triangle, they must satisfy the triangle inequality: the sum of any two sides must be greater than the third side. For sides a, b, c where a ≥ b ≥ ...
Read MoreCreating scrollable Listbox within a grid using Tkinter
A Listbox widget displays a list of items such as numbers, employee names, or any collection of data. When dealing with long lists, we need scrollbars to navigate through all items effectively. By attaching a Scrollbar to a Listbox and configuring them properly, we can create a scrollable interface within a grid layout. Basic Scrollable Listbox Let's start with a simple scrollable Listbox containing numbers from 1 to 100 − # Import the required libraries from tkinter import * from tkinter import ttk # Create an instance of Tkinter Frame win = Tk() win.title("Scrollable Listbox ...
Read MoreCall a Function with a Button or a Key in Tkinter
In Tkinter applications, you can call functions when buttons are clicked or keys are pressed. This is achieved using the command parameter for buttons and the bind() method for key events. Calling a Function with Button Click The simplest way to call a function is by using the command parameter when creating a button ? # Import the required libraries from tkinter import * from tkinter import ttk from tkinter import messagebox # Create an instance of Tkinter Frame win = Tk() # Set the geometry of Tkinter Frame win.geometry("700x350") # Define a ...
Read MoreHow to clear Text widget content while clicking on the Entry widget itself in Tkinter?
The Tkinter Text widget is an input widget that supports multiline user input, functioning as a text editor. You can clear its content using the delete(0, END) method. Similarly, you can clear an Entry widget's content by clicking on it, achieved by binding a function to a click event. Example Here's how to create an Entry widget that clears its placeholder text when clicked ? # Import the required libraries from tkinter import * # Create an instance of Tkinter Frame win = Tk() # Set the geometry of Tkinter Frame win.geometry("700x250") # ...
Read MoreHow to change the Entry Widget Value with a Scale in Tkinter?
The Tkinter Entry widget accepts single-line user input and can be synchronized with a Scale widget to create an interactive value selector. By sharing a common variable between both widgets, changes to the Scale automatically update the Entry value. Key Components To link an Entry widget with a Scale widget, you need: IntVar() or DoubleVar() − A Tkinter variable shared between widgets textvariable parameter in Entry widget variable parameter in Scale widget Basic Example Here's how to create a synchronized Entry and Scale widget ? import tkinter as tk from tkinter ...
Read MoreHow to set the tab order in a Tkinter application?
The tab order in any GUI application determines which widget receives focus when the user presses the Tab key. In Tkinter applications, you can control this navigation order to improve user experience and accessibility. Understanding Tab Order By default, Tkinter sets the tab order based on the sequence in which widgets are created. However, you can customize this behavior using the lift() method to programmatically change the focus order. Example Here's how to create Entry widgets and modify their tab order ? # Import the required libraries from tkinter import * # Create ...
Read MoreKeyboard shortcuts with Tkinter in Python 3
Tkinter provides built-in functionality for binding keyboard shortcuts to specific actions in your application. You can bind individual keys, key combinations, or even mouse buttons to callback functions that execute when the shortcut is triggered. Basic Keyboard Shortcut Example Here's how to create a simple keyboard shortcut that closes the application when Ctrl+X is pressed − # Import the Tkinter Library from tkinter import * # Create an instance of Tkinter Frame win = Tk() # Set the geometry of window win.geometry("700x350") # Define a callback function for exit def quit_program(event): ...
Read MoreHow to resize the background image to window size in Tkinter?
In order to work with images, Python provides the Pillow (PIL) package that enables applications to import and manipulate images. When creating Tkinter applications, you often want the background image to resize automatically with the window. To resize a background image dynamically to match the window size, follow these steps − Import the required libraries (tkinter and PIL). Create a Canvas widget and use create_image() to place the image. Define a function to resize the image based on window dimensions. Bind the resize function to the window's event. Example Here's a complete example ...
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