Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Python's built-in module re (regular expression) provides special characters to match spaces, newlines, tabs etc. spaces can be extracted using the pattern " " and newlines can be extracted using the pattern "" The following is a simple overview of these special characters- Whitespace Character \s : Matches any whitespace character. Tab \t : Matches a tab character. Newline : Matches a newline character. Vertical Tab \v : Matches a vertical tab character. Form Feed \f : Matches ... Read More
Bitwise operators are the operators that are used to perform operations on bits of a binary representation of a number.Bitwise OR (|) Operator OR Operator (|) is one of the types of bitwise operators, which compares each bit of the first operand to the corresponding bit of the second operand and returns 1 if at least one of the bits is 1; else 0 if both bits are 0. You can think of it as similar to addition in decimal, like 0 + 0 = 0, and all other combinations result in 1. But this ... Read More
libxml2 is an open-source XML parsing library which is written in C language and provides all the tools needed to read, parse, modify, validate, and write XML and HTML documents. Installing libxml2 Working with XML data in Python requires parsing libraries. One of the most widely used library for this purpose is libxml2. It is an XML toolkit implemented in C, originally developed for the GNOME project. Python doesn't include libxml2 bindings by default, the most common way to work with libxml2 is through the lxml package. Installing it on macOS is quite challenging. This article tells you about to ... Read More
In C++, If we want to pass arguments to functions we can either pass the actual value, a pointer to the value, or a reference to the value. This concept becomes crucial when we want a function to modify the original variable. So, if we pass parameter to a function either by pass by pointer or pass by reference it will produce the same result. Only difference is that References are used to refer an existing variable in another name whereas pointers are used to store address of variable. It is safe to use reference because it cannot be NULL. ... Read More
What are Python Modules? Python module is a file containing Python functions, variables, constants, and objects with a ".py" extension. This file can be imported inside another program to reuse its functionality. It is quite helpful to understand where the module is stored, some of the reasons include - Troubleshooting errors To install third-party packages correctly To create your known modules To manage multiple Python environments To understand Python's import system Python's Module Search Path When you import ... Read More
In this article, we will see how to execute the if and else section simultaneously in a C or C++, code. This solution is a little bit tricky. When the if and else are executed one after another then it is like executing statements where if-else are not present. But here we will see if they are present how to execute them one after another. Let's go through the different ways to simulate execution of both if and else blocks. This may include using functions, macros, or separating logic completely. Using Separate Functions ... Read More
In C++, the is a header file. This file includes all standard library. Sometimes in some coding contests, when we have to save time while solving, then using this header file is helpful. In software engineering approach we should reduce the minimize the include. Using this header file, it will include lots of files, sometimes that may not be required in the program. So it may increase the compile time and program size. The disadvantages of this header file is listed below. This is ... Read More
Hexadecimal is a base 16 numbering system that uses 16 digits (from 0 to 9, and then A to F) to represent numbers. It is commonly used in computing systems to represent and store data. In this article, we will learn how to convert a normal integer to a hexadecimal string using C++ program. Integer to Hex String Conversion Here is a list of approaches for converting an integer to a hexadecimal, which we will be discussing in this article with stepwise explanation and complete example codes. Using std::stringstream ... Read More
What are Python File Extensions? Python file extensions are the suffixes that are added to the end of file names, which indicate the type of content inside the file and how it relates to the Python programming environment. These extensions help the interpreter, operating system, and developers understand how to process or execute the file. The .py, .pyc, .pyo, and .pyd files are the most commonly used Python file extensions and have their significance when it comes to executing python programs. Here are the Python file extensions and their descriptions - .py: The input source code that you've written. ... Read More
In Python, both single quotes (') and double quotes (") are used to define string literals, and they function in the same way. For example, if a string contains a single quote character, like in a contraction, i.e., it’s by using double quotes avoids the need for escape characters by making the code cleaner and easier to read. Similarly, single quotes can be useful when a string contains double quotation marks. Single Quotes in Python Single quotes are used to wrap small and short strings in Python, such as string literals or identifiers. We must remember that using single quotes ... Read More