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Articles on Trending Technologies
Technical articles with clear explanations and examples
Default window color Tkinter and hex color codes in Tkinter
A Tkinter window can be customized by adding properties and attributes such as background color, foreground color, width, height, etc. The color attribute in config() defines the default color of the main window. We can set the color of the window by defining either Hex Color (e.g., #000 for Black) or the Name of the color. Setting Background Color with Hex Codes Hex color codes provide precise color control using hexadecimal values. The format is #RRGGBB where RR, GG, and BB represent red, green, and blue components ? # Import the required libraries from tkinter ...
Read MoreHow to compile a Python 3 app to an .exe using Tkinter?
Converting a Python Tkinter application to an executable (.exe) file allows you to distribute your application without requiring Python installation on the target machine. PyInstaller is the most popular tool for creating standalone executables from Python applications. Installation and Setup First, install PyInstaller using pip − pip install pyinstaller Creating the Tkinter Application Let's create a simple Tkinter application that we'll convert to an executable file − # Import the required libraries from tkinter import * # Create an instance of Tkinter Frame win = Tk() # Set the ...
Read MoreTkinter dropdown Menu with keyboard shortcuts
A dropdown menu is a list of vertically stacked menu items that appears in the top menu bar of an application. We can create a menu bar in a Tkinter application by creating an object of Menu() which contains all the menu items. Sometimes we want to provide keyboard shortcuts to menu items for faster navigation. To bind keyboard shortcuts to menu items, we use the bind_all(, callback) method which applies the shortcut globally across the entire application. Basic Syntax Here's the basic structure for creating a dropdown menu with keyboard shortcuts ? # Create ...
Read MoreHow to bind events to Tkinter Canvas items?
Tkinter events can be bound with widgets to perform operations when user interactions occur. You can bind event handlers to Canvas items using the tag_bind() method, making canvas items interactive and dynamic. Binding Events to Canvas Items Use canvas.tag_bind(item_id, event, callback) to bind events to specific canvas items ? import tkinter as tk # Create window root = tk.Tk() root.title("Canvas Item Events") root.geometry("400x300") # Create canvas canvas = tk.Canvas(root, width=400, height=300, bg='white') canvas.pack() # Create canvas items circle = canvas.create_oval(50, 50, 150, 150, fill='lightblue', outline='blue', width=2) rectangle = canvas.create_rectangle(200, 50, 300, 150, fill='lightgreen', ...
Read MoreHow to specify where a Tkinter window should open?
Tkinter allows you to control where a window appears on screen using the geometry() method. The geometry method accepts a string format: "widthxheight+x_offset+y_offset" to set both size and position. Syntax window.geometry("widthxheight+x_offset+y_offset") Where: width, height − Window dimensions in pixels x_offset, y_offset − Position from top-left corner of screen Example Here's how to create a window that opens at position (300, 300) ? # Import the required libraries from tkinter import * # Create an instance of Tkinter Frame win = Tk() # Set the geometry win.geometry("700x350+300+300") ...
Read MoreProgram to find out the dot product of two sparse vectors in Python
A sparse vector is a vector where most elements are zero. The dot product of two vectors is calculated by multiplying corresponding elements and summing the results. For sparse vectors, we can optimize by skipping zero elements. Problem Statement Given two sparse vectors represented as lists, we need to calculate their dot product efficiently. The vectors are stored as objects with a nums attribute containing the list elements. Example If vector1 = [1, 0, 0, 0, 1] and vector2 = [0, 0, 0, 1, 1], the dot product is ? 1×0 + 0×0 + ...
Read MoreProgram to find out the number of boxes to be put into the godown in Python
Suppose we have two arrays containing integers. One list contains the height of some unit width boxes and another array contains the height of rooms in the godown. The rooms are numbered 0...n, and the height of the rooms is provided in their respective indexes in the array godown. We have to find out the number of boxes that can be pushed into the godown. A few things have to be kept in mind: The boxes can't be put one on another. The order of the boxes can be changed. ...
Read MoreProgram to find out if the strings supplied differ by a character in the same position in Python
Suppose, we are provided an array that contains several strings of the same length. We have to find out if any two of the supplied strings differ by a single character at the same position. If this difference is present, we return True, otherwise we return False. So, if the input is like words = ['pqrs', 'prqs', 'paqs'], then the output will be True. The output is True because all strings differ at index 1 ('q', 'r', 'a'), so any two pairs have a difference in the same position. Algorithm Steps To solve this, we will follow ...
Read MoreProgram to find out the index of the most frequent element in a concealed array in Python
Suppose we are given a class called TestArray that contains a private array which can only contain values 0 or 1, and two public member functions length() and query(). The function length() returns the length of the array and the function query() returns three different values comparing various values in the array. The function takes four indices p, q, r, s as input and works like this: If all four values at the given indices are the same (either all 0s or all 1s), it returns 4 If three values ...
Read MoreProgram to find out the index in an array where the largest element is situated in Python
Finding the index of the largest element in an array is a common problem. This tutorial demonstrates a unique approach where the array is encapsulated in a class and can only be accessed through specific member functions. Problem Statement We have a class called TestArray that contains an array not accessible by other classes. It provides two public member functions: length() − returns the length of the array compare(l, r, x, y) − compares sums of two subarrays The compare() function works as follows: ...
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