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Articles by Samual Sam
Page 5 of 151
How to optimize Python Dictionary for performance?
Python dictionaries are heavily optimized data structures with excellent performance characteristics. Creating a dictionary from N keys or key/value pairs is O(N), fetching values is O(1) average case, and insertion is amortized O(1). Python's built-in classes are implemented using dictionaries under the hood, demonstrating their efficiency. Dictionary Performance Characteristics Understanding the time complexity of dictionary operations helps in writing efficient code: import time # Creating a large dictionary - O(N) data = {f"key_{i}": i for i in range(100000)} print(f"Dictionary created with {len(data)} items") # Accessing values - O(1) average case start_time = time.time() value ...
Read MoreHow to create Python dictionary from the value of another dictionary?
You can create a new Python dictionary by combining values from other dictionaries using several methods. Python provides multiple approaches to merge dictionaries, each suitable for different scenarios and Python versions. Using Dictionary Unpacking (Python 3.5+) The ** operator unpacks dictionaries and combines them into a new dictionary ? a = {'foo': 125} b = {'bar': "hello"} c = {**a, **b} print(c) {'foo': 125, 'bar': 'hello'} Using dict() Constructor For older Python versions, you can use the dict() constructor with unpacking ? a = {'foo': 125} b = ...
Read MoreHow can we read Python dictionary using C++?
A dictionary in Python is a collection of key-value pairs where each key must be unique. Unlike lists which are indexed by numbers, dictionaries are accessed using keys that can be immutable types like strings, numbers, or tuples. Lists cannot be used as keys because they can be modified. Dictionaries are created using {}, and key-value pairs are added with commas. We can store, retrieve, and delete values using their keys. To check if a key exists, we can use the in keyword. Reading Python Dictionaries using C++ There are several C++/Python bindings available for facilitating communication ...
Read MoreHow can I preserve Python tuples with JSON?
JSON format doesn't have a built-in tuple type, so Python's json module converts tuples to JSON arrays (lists). This means the immutability of tuples is lost during serialization. However, you can preserve tuples using custom encoders and decoders or alternative serialization methods. Problem: Default JSON Conversion By default, Python tuples are converted to JSON arrays ? import json data = { "coordinates": (10, 20), "colors": ["red", "blue"], "dimensions": (1920, 1080, 32) } json_string = json.dumps(data) print("JSON string:", json_string) # When loaded ...
Read MoreLearn How to use Dstat tool to Monitor Linux Server Performance?
Dstat is a versatile resource statistics tool that combines the functionality of iostat, vmstat, netstat, and ifstat. This powerful command-line utility allows system administrators to monitor server resources in real-time, making it ideal for troubleshooting performance issues and analyzing system behavior. Features Combines vmstat, iostat, ifstat, netstat functionality and more Shows statistics in the same timeframe for easy correlation Enables ordering counters as they make sense during analysis or troubleshooting Features modular design for flexibility Written in Python, making it easily extendable Supports custom counters and external plugins Can summarize grouped block/network devices and provide total numbers ...
Read MoreLearn How to Install SMPlayer in Ubuntu
SMPlayer is a free multimedia player for Windows and Linux that comes with built-in codecs. It can play YouTube videos, search and download subtitles, and includes additional features like a thumbnail generator and various audio/video filters. Features YouTube Support − Search, play, and download YouTube videos directly Built-in Filters − Multiple video and audio filters available Thumbnail Generator − Creates video thumbnails for easy navigation Video Equalizer − Adjust brightness, contrast, saturation, and gamma Customizable Interface − Multiple skins and themes available Speed Control − Variable playback speed from 0.25x to 4x Synchronization − Audio and subtitle ...
Read MoreLearn How to Install Adobe Flash Player On Ubuntu 16.4.
Adobe Flash Player is a browser plugin that enables web applications to deliver rich multimedia content, including audio/video playback and interactive experiences. It is essential for running SWF files — Adobe Flash file format for displaying animated vector graphics on the web. This article explains how to install Adobe Flash Player on Ubuntu 16.04. Prerequisites A machine installed with Ubuntu 16.04 A user with sudo privileges or root access Active internet connection for downloading packages Step 1: Install Ubuntu Restricted Extras Adobe Flash Player requires the ubuntu-restricted-extras package, which contains essential software not included ...
Read MoreHow to Find out Linux Version currently Installed on your Machine?
Are you new to Linux or Ubuntu? Do you want to know which version of Linux distribution is currently installed on your machine? This article explains various methods to identify your Linux distribution version and kernel information using simple command-line tools. Method 1: Using /etc/*-release Files The most comprehensive way to get distribution information is by examining the release files. Use the following command − $ cat /etc/*-release The sample output should be like this − DISTRIB_ID=Ubuntu DISTRIB_RELEASE=16.04 DISTRIB_CODENAME=xenial DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS" NAME="Ubuntu" VERSION="16.04.1 LTS (Xenial Xerus)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 16.04.1 LTS" ...
Read MoreHow to Copy a File to Multiple Directories in Linux?
Copying a file to multiple directories simultaneously is a common task in Linux system administration. This article demonstrates several efficient methods to copy a file to multiple target directories using command-line tools like cp, xargs, and find. Method 1: Using cp with xargs The most straightforward approach combines echo, xargs, and cp to copy a file to multiple directories in one command. Basic Syntax echo dir1 dir2 dir3 | xargs -n 1 cp file1 This command works by: echo outputs the directory names separated by spaces xargs -n 1 processes one ...
Read MoreHow to Setup Rsyslog Remote Logging on Linux
Every Linux distribution comes with logging systems to record system activities, which helps during system troubleshooting. Rsyslog is an open-source, high-performance logging system available for major Linux distributions including Debian and Red Hat based systems. Compared to the traditional SYSLOG protocol, it offers additional features such as content-based filtering, TCP transport, and extensive configuration options. This article describes how to setup Rsyslog Remote Logging in simple steps. Installation If Rsyslog is not installed on your Linux system, install it using the following command − $ sudo apt-get install rsyslog rsyslog-doc The output should be ...
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