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Programming Articles
Page 617 of 2547
Merge two sorted arrays in Python using heapq?
The heapq module in Python provides an efficient way to merge multiple sorted iterables into a single sorted sequence. The heapq.merge() function is specifically designed for merging sorted arrays while maintaining the sorted order. The heapq.merge() Function The heapq.merge() function accepts multiple sorted iterables and returns an iterator that produces elements in sorted order. It uses a min-heap internally to efficiently merge the arrays without loading everything into memory at once. Syntax heapq.merge(*iterables, key=None, reverse=False) Basic Example Here's how to merge two sorted arrays using heapq.merge() ? import heapq ...
Read MoreCreating child process using fork() in Python
The fork() function in Python allows you to create child processes by duplicating the current process. This is a fundamental concept in Unix-like systems for process management and multithreading environments. When fork() is called, it creates an exact copy of the calling process. The return value helps distinguish between parent and child processes: 0 indicates the child process, a positive value indicates the parent process (containing the child's PID), and a negative value indicates an error occurred. Understanding fork() Return Values The fork() function returns different values depending on which process you're in ? Child ...
Read MorePlay a video in reverse mode using Python OpenCv
OpenCV (Open Source Computer Vision) is a powerful library for image and video processing in Python. One interesting application is playing videos in reverse mode by manipulating the frame order. Application Areas of OpenCV Facial recognition system Motion tracking Artificial neural network Deep neural network Video streaming Installation For Windows ? pip install opencv-python For Linux ? sudo apt-get install python-opencv Steps to Play Video in Reverse Import OpenCV library (cv2) Load the video file as input Extract all frames from the video and ...
Read MoreRead and Write to an excel file using Python openpyxl module
Python provides the openpyxl module for reading and writing Excel files. This powerful library allows you to create, modify, and extract data from Excel workbooks programmatically. Installation Install openpyxl using pip ? pip install openpyxl Getting Sheet Title When you create a new workbook, it comes with a default sheet ? import openpyxl my_wb = openpyxl.Workbook() my_sheet = my_wb.active my_sheet_title = my_sheet.title print("My sheet title: " + my_sheet_title) My sheet title: Sheet Changing Sheet Title You can customize the sheet name by modifying the ...
Read MoreDecimal Functions in Python
The Decimal module in Python provides precise decimal floating-point arithmetic, avoiding the common rounding errors that occur with standard floating-point numbers. This module is particularly useful for financial calculations where precision is critical. To use the Decimal module, you need to import it first ? import decimal Square Root and Exponential Functions The sqrt() method calculates the square root of a decimal number, while exp() returns ex for a given decimal value ? import decimal my_dec = decimal.Decimal(25.36) print(my_dec) print('Square Root is:', my_dec.sqrt()) print('e^x is:', my_dec.exp()) 25.3599999999999994315658113919198513031005859375 Square ...
Read MoreCreate a Website Alarm Using Python
In this section we will see how to create a website alarm system using Python. This tool automatically opens a specified website URL in your browser at a predetermined time. Problem Statement Create a program that opens a website URL on the browser by taking a website URL and time as input. When the system time reaches the specified time, the webpage will be opened automatically. We can store different web pages in our bookmark sections. Sometimes we need to open some web pages every day at a specific time to do some work. For that purpose, ...
Read MorePython Program to calculate the Round Trip Time (RTT)
Here we will see how Python can be used to get the Round Trip Time (RTT). The RTT is the time taken by the entire trip of a signal — the time between when a signal is sent and when the acknowledge signal is received. The RTT results vary based on different parameters like ? The data transfer rate of the sender's side. The nature of the transmission media. The actual distance between the sender and receiver. The number of nodes between sender and receiver. ...
Read MoreBirthday Reminder Application in Python
In this tutorial, we will create a birthday reminder application using Python that checks for birthdays on the current date and sends system notifications. Problem Statement Create a Python application that checks whether there is any birthday on the current day. If it's someone's birthday from our list, send a system notification with their name. We need a lookup file to store dates and names. Create a text file named birth_day_lookup.txt with this format ? 10-January John Doe 15-March Jane Smith 22-December Alice Johnson ...
Read MoreUnix filename pattern matching in Python
Unix filename pattern matching in Python is accomplished using the fnmatch module. This module provides shell-style pattern matching capabilities to compare filenames against patterns and returns True or False based on matches. Importing the fnmatch Module First, import the fnmatch module from Python's standard library ? import fnmatch Unix Wildcard Patterns The fnmatch module supports standard Unix wildcards ? * − Matches any number of characters (including none) ? − Matches exactly one character [seq] − Matches any character in the sequence [!seq] − Matches any character not in the sequence ...
Read MorePython Interface to UNIX syslog library routines
The syslog module provides a Python interface to the UNIX system logging facility. It allows your Python programs to send messages to the system log, which administrators can monitor for debugging and system monitoring purposes. To use this module, we need to import it ? import syslog syslog.syslog() Method This method sends a string message to the system logger. You can specify a priority level for the message. Syntax syslog.syslog(message) syslog.syslog(priority, message) Parameters: message - String message to log priority - Optional priority level (LOG_DEBUG, LOG_INFO, LOG_NOTICE, LOG_WARNING, ...
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