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Introduction to PySpark substring

PYSPARK SUBSTRING is a function that is used to extract the substring from a DataFrame in PySpark. By the term substring, we mean to refer to a part of a portion of a string. We can provide the position and the length of the string and can extract the relative substring from that.

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PySpark SubString returns the substring of the column in PySpark.

We can also extract character from a String with the substring method in PySpark. All the required output from the substring is a subset of another String in a PySpark DataFrame. This function is used in PySpark to work deliberately with string type DataFrame and fetch the required needed pattern for the same.



column name is the name of the column in DataFrame where the operation needs to be done.

s: The starting Index of the PySpark Application.

l: The Length to which the Substring needs to be extracted.

df: The PySpark DataFrame.

b = a.withColumn("Sub_Name",a.Name.substr(1,3))


The withColumn function is used in PySpark to introduce New Columns in Spark DataFrame.

a. Name is the name of column name used to work with the DataFrame String whose value needs to be fetched.

Working Of Substring in PySpark

Let us see somehow the SubString function works in PySpark:-

The substring function is a String Class Method. The return type of substring is of the Type String that is basically a substring of the DataFrame string we are working on.

A certain Index is specified starting with the start index and end index, the substring is basically the subtraction of End – Start Index.

String basically is a char[] having the character of the String with an offset and count. A new string is created with the same char[] while calling the substring method. A different offset and count is created that basically is dependent on the input variable provided by us for that particular string DataFrame.

The count is the length of the string in which we are working for a given DataFrame.

By This method, the value of the String is extracted using the index and input value in PySpark.

One more method prior to handling memory leakage is the creation of new char[] every time the method is called and no more offset and count fields in the string.


Let us see some Example of how the PYSPARK SubString function works:-

Example #1

Let’s start by creating a small DataFrame on which we want our DataFrame substring method to work.

a= spark.createDataFrame(["SAM","JOHN","AND","ROBIN","ANAND"], "string").toDF("Name")

This creates a Data Frame and the type of data in DataFrame is of type String.

Let us see the first example to check how substring normal function works:-


This will create a New Column with the Name of Sub_Name with the SubStr


Example #2

Let’s check if we want to take the elements from the last index. The last index of a substring can be fetched by a (-) sign followed by the length of the String.

Let’s work with the same data frame as above and try to observe the scenario.

Creation of Data Frame.

a= spark.createDataFrame(["SAM","JOHN","AND","ROBIN","ANAND"], "string").toDF("Name")

Let’s try to fetch a part of SubString from the last String Element.

b = a.withColumn("Name_End" ,a.Name.substr(-2,2))

This prints out the last two elements from the Python Data Frame.

b = a.withColumn("Name_End" ,a.Name.substr(-3,3)).show()

This will print the last 3 elements from the DataFrame.


The substring can also be used to concatenate the two or more Substring from a Data Frame in PySpark and result in a new substring.

Let’s check an example for this by creating the same data Frame that was used in the previous example.

Creation of Data Frame.

a= spark.createDataFrame(["SAM","JOHN","AND","ROBIN","ANAND"], "string").toDF("Name")

Now let’s try to concat two sub Strings and put that in a new column in a Python Data Frame.

Since SQL functions Concat or Lit is to be used for concatenation just we need to import a simple SQL function From PYSPARK.

from pyspark.sql.functions import concat, col, lit

This will all the necessary imports needed for concatenation.

b = a.withColumn("Concated_Value", concat(a.Name.substr(-3,3),lit("--"),a.Name.substr(1,3))).show()

This will concatenate the last 3 values of a substring with the first 3 values and display the output in a new Column. If the string length is the same or smaller then all the strings will be returned as the output.


From these above examples, we saw how the substring methods are used in PySpark for various Data Related operations.


From the above article, we saw the use of SubString in PySpark. From various examples and classification, we tried to understand how the SubString method works in PySpark and what are is used at the programming level.

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Learn How To Use The Postgresql Position()

Introduction to PostgreSQL POSITION()

As we know PostgreSQL supports various data types like string, if we are working with string we might need to manipulate the string data, there are various functions to work with the string-like we might have to find the substring of any string. The PostgreSQL POSITION function is used to find the location or position of the substring within a string. By using the position function we can easily find the location of string-like if we have a string “PostgreSQL is awesome” and we wanted to find the location of the substring “awesome” inside the string.

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Consider the following syntax of the POSITION() function:



[SUBSTRING]: The input string is a substring to search from a string.

[string]: The string from which we want to search a substring.

How does PostgreSQL Position() function work?

One(1) is the first position in the string.

If the POSITION function cannot find the substring within the string, the position function will return the position as zero(0).

Consider the following example to understand the working of the PostgreSQL Position function.

SELECT POSITION('is' IN 'PostgreSQL is awesome') AS position_of_is

The above syntax creates a temporary variable of name position_of_is containing a number. In our case, this number is 12 because the string is “PostgreSQL is awesome,” the first string position returned by the PostgreSQL POSITION function is at character number 12, which will be stored in the position_of_is temporary variable.

Illustrate the result of the above statement by using the following snapshot.

This function returns us the first position or location of the occurrence of the substring within the string.

Examples to Implement Position() Function in Postgre SQL

We will create tables named ‘category’ to understand the examples of this function in detail.

Consider the following CREATE TABLE statement to create the category table.

CREATE TABLE category ( category_id serial PRIMARY KEY, category_name VARCHAR(80) NOT NULL );

Now, we will insert some data in the ‘category’ table by using the INSERT TABLE statement:

INSERT INTO category(category_name)values ('furniture'), ('Electronics'), ('Cloths');

Illustrate the result of the above statement by using the following snapshot and SQL statement.

select * from category;

1. Consider the following statement, which finds the substring’ n’ position in the column ‘category_name’. 

SELECT category_id, category_name, POSITION('n' IN "category_name") FROM category;

Illustrate the result of the above statement by using the following snapshot.

2. Consider the string ‘PostgreSQL is awesome’ from which we will find out the position of the ‘awesome’ using the PostgreSQL POSITION function.

SELECT POSITION('awesome' IN 'PostgreSQL is awesome');

Illustrate the result of the above statement by using the following snapshot.

3. Consider the following example to understand the case sensitivity.

SELECT POSITION('AWESOME' IN 'PostgreSQL is awesome');

Here we can see that the result of position is zero (0), which means that the string AWESOME does not exist in the string ‘PostgreSQL is awesome’.

4. Consider the following example to understand if the string occurs multiple times.

SELECT POSITION('is' IN 'This is a PostgreSQL');

Illustrate the result of the above statement by using the following snapshot.

Here you can find the substring ‘is’ appears multiple times in the input string ‘This is a PostgreSQL.’

Advantages of using the Position() function in PostgreSQL

The POSITION() function considers a string character case while searching for a substring which means it is case sensitive.s

This function always returns the first instance of occurrence.

We can find the required string position within a table row using the POSITION function.


From the above article, we hope you understand how to use this function and how the POSITION() function works. Also, we have added several examples of the POSITION() function to understand it in detail.

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Learn The Essential Idea Of The Jsoup Maven

Introduction to jsoup maven

Basically, Java provides different types of libraries to the user, in which jsoup maven is one of the libraries that are provided by Java. Jsoup maven normally is used while we need to work with the real-time HTML pages. Jsoup maven provides the different types of API to fetch the different URLs and manipulates them with the help of HTML5 DOM and a selector of CSS as per requirement. When we talk about the working of jsoup maven, the jsoup maven implements the HTML5 specification and it parses the HTML web page the same as the DOM parser or we can say that is the same as modern browsers.

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What is jsoup maven?

Jsoup is an open-source Java library utilized essentially for separating information from HTML. It additionally permits you to control and yield HTML. It has a consistent improvement line, extraordinary documentation, and a familiar and adaptable API. Jsoup can likewise be utilized to parse and fabricate XML.

In this instructional exercise, we’ll utilize the Spring Blog to delineate a scratching exercise that exhibits a few components of jsoup:

Stacking: Bringing and parsing the HTML into a Document.

Separating: Choosing the ideal information into Elements and navigating it.

Removing: Getting properties, text, and HTML of hubs.

Changing: Adding/altering/eliminating hubs and altering their traits.

To utilize the jsoup library in your venture, add the reliance to your chúng tôi For the implementation of jsoup maven, we need the following dependencies.

Jsoup is working on real-time HTML web pages. It gives an extraordinarily favorable API to getting URLs and removing and controlling data, using the best of HTML5 DOM techniques and CSS selectors.

jsoup carries out the WHATWG HTML5 determination and parses HTML to similar DOM as present-day programs do.

Scratch and parse HTML from a URL, document, or string

Find and concentrate information, utilizing DOM crossing or CSS selectors

Control the HTML parts, qualities, and text.

Clean client submitted content against a safe list, to forestall XSS assaults

Yield clean HTML

Basically, jsoup is used to manage all assortments of web pages or we can say that HTML that we found so at that time jsoup creates a parse tree.

Install Jsoup with maven

Now let’s see how we can install Jsoup as follows.

There are two ways to install jsoup as follows.

By using maven dependence:

To introduce jsoup utilizing experts, add given reliance on chúng tôi record.

By Using Jar File:

Using jsoup

Before you can work with the DOM, you need the parable report markup. That is the message content that is shipped off the program. By then all worker side code will have executed and created whatever powerful substance is required. Jsoup addresses a Web page utilizing the org.jsoup.nodes.Document object. It tends to be made from a substance string or by means of an association. Commonly, the most straightforward decision is the last mentioned, however, there are situations where you might need to bring the page yourself, like where an intermediary worker is involved or qualifications are required.

By using two ways we can fetch the web pages, first, we need to establish the connection then call the get() function, and the second way we can use the jsoup function.

TreeBuilder class, however, has a state and is by all accounts accomplishing basically everything except it’s made from inside a technique in this way the entire activity is a string protected by the goodness of stack/string repression.

The jsoup safelist sanitizer works by parsing the info HTML (in a protected, sand-boxed climate), and afterward emphasizing through the parse tree and just permitting known-safe labels and characteristics (and qualities) through into the cleaned yield. It doesn’t utilize customary articulations, which are improper for this undertaking.

jsoup Examples

Now let’s see the example of jsoup maven as follows.

First, we need to create the maven project in eclipse as shown in the following screenshot as follows.

Now add above mentioned dependencies in the chúng tôi file as follows.

In the above code, we added jsoup dependencies as shown.

Now create a package inside the demo1 project and inside the package we need to create the class as shown in the following screenshot as follows.

Now inside the class file write the following code as follows.

package com.sample; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import; import; public class jclass { public static void main(String[] args) { Document docu; try { String title_page = docu.title(); System.out.println("title : " + title_page); Ele links_web ="a[href]"); for (Ele link : links_web) { System.out.println("n web_link : " + link.attr("href")); System.out.println("web_text : " + link.text()); } } catch (IOException e) { e.printStackTrace(); } } }


By using the above code, we try to find out the all hyperlinks of chúng tôi Here we first import the required packages and library as shown. After we write the code for HTTP protocol and how we can get the all hyperlinks for google as shown. The final output of the above program we illustrated by using the following screenshot as follows.

Similarly, we can write the program for fetching images, metadata and form input, etc.


We hope from this article you learn more about the jsoup maven. From the above article, we have taken in the essential idea of the jsoup maven and we also see the representation and example of jsoup maven. From this article, we learned how and when we use the jsoup maven.

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Learn The Top 8 Alternatives Of Angular

Introduction to Angular

AngularJS is an open-source web framework as a first version. Google backs AngularJS. AngularJS is the first front-end framework based on the MVC design pattern. This allows the feature called two-way binding, which enables it to reflect changes continuously on a page. Also, AngularJS provides features such as Dependency Injection, ready-to-use templates, and testing. It allows the development of Single Page Applications with neat and clean code. These features make AngularJS unique.

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What is AngularJS?

Front-end technologies are evolved very much in the last 20 years. From very basic HTML, CSS, and JavaScript to many libraries and frameworks are available now with great functionality. Developers are now able to build very complex user interfaces in a very short amount of time. Since 2010 JavaScript frameworks have started to evolve, and at first, AngularJS entered the market. It became very famous in a short time. Eventually, as complications increased, a new version of Angular was written but incompatible with the old version. Due to this popularity of Angular started to decrease.

Angular v2 and above is a complete rewrite and a TypeScript-based framework. Angular features mobile support, whereas AngularJS does not. Angular is an improvement and has compatibility with newer versions.

List of Angular Alternatives

Below are the different Angular Alternatives which are as follows:

1. React

React is becoming one of the most popular frameworks nowadays. Some developers are switching from Angular to React. One of the engineers at Facebook created it. React is used in the development of Single-page as well as mobile applications. React provided innovative features such as Virtual DOM and one-way data flow.

React is declarative and has components based. This allows composing complex UI’s while cleanly maintaining code. React works in the View layer of the application. React is smaller and usually requires additional libraries while developing complex React Applications.

2. Vue

Another angular alternative is Vue. chúng tôi is a progressive JavaScript framework created by author Evan You, which is now open source. Vue is powerful enough to build single-page applications. Vue has some similar concepts from both AngularJS and React. It works in the View layer of an application, has a virtual DOM feature, and supports additional libraries, similar to React. Vue has a template style similar to Angular, but performance-wise, Vue is more powerful because it is more lightweight.

Vue offers features such as Reactive Interfaces, CSS transitions & Animation, custom filters, and straightforward code. Vue is easy to understand and flexible.

3. Ember

Ember is an open-source JavaScript framework. It allows developers to build scalable single-page applications using best practices in a framework. Ember is based on Model-View-View-Model (MVVM) pattern.

Ember provides features such as Ember CLI, Ember templates, and the Ember Inspector tool used for debugging. Ember offers a friendly API that is easy to understand and work with.

4. Meteor

Meteor is a complete platform for developing web and mobile apps in pure JavaScript. It’s a free and open-source JavaScript framework that runs on the client and server. Meteor integrates directly with MongoDB and can propagate data changes to the client without any extra code. Meteor uses its template engine for design and can be utilized with Angular, React, and Vue frameworks.

Meteor is the best Angular Alternative as it is a full-stack framework; it is possible to build everything in an application by learning it once. Meteor is easy to learn and enables it to build faster, making it a favorite for developers.

5. Polymer

A polymer is an open-source JavaScript library for building web applications developed by Google developers. YouTube, Google Earth, Netflix, and Electronic Arts, among others, use Polymer.

A polymer is built on the concept of web components. Polymer offers features such as building custom HTML elements, cross-browser compatibility, and Polymer CLI. The polymer has some downsides, such as a lack of documentation and support, but being backed by Google, it has the potential to gain a significant market share.

6. Backbone

Developers use Backbone, a lightweight JavaScript library designed for developing single-page applications. It is based on the Model-View-Presenter (MVP) design pattern, which abstracts data into models, and DOM into views and binds these two using events. chúng tôi has been in the market for a long time and has a mature platform.

Backbone provides features such as a RESTful JSON interface, Syncing with the back-end, and Event-Driven communication. Backbone allows the building of web applications and mobile applications in an organized and well-structured format.

7. Aurelia

Aurelia is a next-gen modern open-source UI framework for developing web and mobile applications. It allows designing complex apps by using pure JavaScript or TypeScript. It follows the latest JavaScript standards. Aurelia is clean and has a nice API. Aurelia is concise and simple and at the same time, it is powerful and flexible. Aurelia is modular, it has a collection of libraries that can be used separately, and when combined, they form a powerful and robust framework.

8. Mithril

This is one of the most famous alternatives present for angular today. Mithril is a modern client-side JavaScript framework for building Single Page Applications. It’s small (< 8kb grip), fast, and provides routing and XHR utilities out of the box. Mithril is used by companies like Nike and Vimeo and open-source platforms like Liches.

It already has available documentation for common tasks. Mithril focuses on accomplishing meaningful work efficiently. Mithril is a complete platform for building web and mobile apps in pure JavaScript.

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Learn The Top 5 Alternatives Of Audacity

Introduction to Audacity Alternatives

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Audacity is not only an audio editing software but can also be used for many other features like post-processing all types of audio, adding effects like normalization, trimming and fading in & out, mixing entire albums, such as Tune-yards, etc.

Features of Audacity

Some of the special features of Audacity are given below,

Users can select the look and feel of the application using the four user-selectable themes.

Scrubbing feature.

Scheduling a recording using a timer record.

Punch and roll recording.

Navigation controls, zoom effect, and single-track edit.

Conversion of cassette tapes into digital audio records.

It provides a similar interface on different operating systems.

Noise reduction features.

Supports multichannel modes.

Audio spectrum analysis using Fourier transforms analysis.

List of Audacity Alternatives 1. Adobe Audition

Adobe Audition is the complete audio editing software from the house of software tycoon Adobe. It helps to do simple audio editing to complex music production. Professionals commonly use this software for music production and high-quality editing. This software is one of the best alternatives for Audacity. Some of the features of this software are listed below.

It has a great frequency spectrum analysis feature.

Multitrack editing.


Clip editing.

Dereverb and denoise effects.

Clip spotting.

Compound media import.

Ability to zoom the multitrack and edit window to a specific duration.

2. Ocenaudio

Ocenaudio is an alternative to Audacity and is perfectly suitable for users searching for similar free audio editing software like Audacity. It has almost all the features available in Audacity. It supports most of the major and minor audio formats and allows the loading of multiple audio files simultaneously. Let us see some of the important features of Ocenaudio.

Attractive and simple interface.

Support VST plugins.

Real-time previews of effects.

Multiple audio file management.

Editing large files is possible.

Audio snapshots at any point.

3. WavePad

All editing features.

Audio effects.

Spectral analysis.

Speech Synthesis.

A voice changer feature is available.

Allows removing vocals from music tracks.

Make ready to use ringtones

4. FL Studio

FL Studio is digital audio editing software developed by the image-line software company. Its initial release was in 1997, and from that period, many versions of this software have been released; the latest version, 20.1.2, was released in 2023. This software is available in four different editions: fruity version, producer edition, signature bundle, and All plugins bundle. FL Studio is used by many famous music bands and music directors for production. It is available in English and Dutch language and supported in Windows and Mac operating systems. Let’s see some of its features.

A large number of playlist tracks.

More mixer tracks.

We are consolidating tracks.

Allows the export of 24-bit WAVs.

Smart zooming option.

Many keyboard shortcuts are available.

Many plugins are available.

5. Ardour

Ardour is a digital audio workstation that allows users to record, mix, edit, and master audio files. It is more suitable for professionals who deal with quality and complex music production. Paul Davis was the software’s original author, initially released in 2005. It can run on different OS like Windows, Mac, Linux, etc. Many plugins support it, enabling additional features ranging from audio effects to dynamic control. It is one of the best tools for recording talented performers on actual instruments. When we search for an alternative to Audacity, this software stands at the front of the list. Some of its features are.

A different interface is available.

Flexible recording.

A large number of multichannel tracks are available.

Non-destructive editing with unlimited undo/redo options.

Frame-by-frame display of the timeline of the video.

Matrix style patching/routing.

Automation for everything.

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Learn To Use The Google Play Store On An Android Device

The Google Play Store gives you access to millions of apps and games you can download for Android devices. It also offers movies, books, and music, though of course not all of them are available in every country. All you need to get started is a Google account — you won’t be able to browse or download content if you don’t have one. Once you have that ready, here’s how to use the Play Store on any Android device.

Although using the Play Store isn’t exactly rocket science, we want to explain a few basic things you should know. These include things like downloading content, adding a payment method, and redeeming a gift card.

Download apps and games

Once you find something you like, tap on it to bring up additional info. This includes a description, user ratings, screenshots, videos, and, of course, the Install button, or a buy button with a price in your currency if it costs something upfront. Tap on that and wait for the device to do its magic. When completed, you’ll get a notification that the content has been downloaded to your device and can be used — tap the notification or the Open button.


Search for content via the search box, categories, or home screen.

Tap on the game or app you like to bring up additional info.

Hit the Install/buy button to download content to your device.

Tap the Open button or the notification to access the downloaded content.

You can also get books and audiobooks

Of course, the Google Play Store isn’t only about finding apps and games. Google also has plenty of books and audiobooks. These can be found under the Books tab on the Google Play Store home screen.

The tap is further divided into categories such as Ebooks, Audiobooks, Comics, and Children’s books, all accessed through a carousel menu.


Search for content in the Books tab.

Tap on the content you like to bring up additional info.

Check out details and tap Ebook, Audiobook, or a similar button (often with a price attached) to purchase the content. You can use Free sample or Preview to get a taste first.

Keep in mind that as always, some of the items on the Play Store are free, while you’ll have to pay for others. You’ll need to add a payment method to your Google account to buy content from the Play Store, which we’ll look at in the next section.

How to manage your Google Play Store payment methods

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To buy an app, game, or any other piece of content via the Play Store, you need to add a credit or debit card to your account, or else use PayPal or a Google Play Store gift card. The process is simple and only takes a minute or two.

How to add a payment method

The first step is to launch the Play Store app and tap on your profile icon in the top-right corner. Then select Payments & subscriptions, and tap on Payment methods. The last step is to follow on-screen instructions by entering the required details.


Launch the Google Play Store app and tap on your profile icon in the top-right corner.

Select Payments and subscriptions.

Tap on Payment methods and follow the on-screen instructions.

Enable authentication for purchases

Hit the profile icon in the top-right corner and tap on Settings.

Tap on Authentication.

Choose Require authentication for purchases and select your preference.

It’s also a good idea to enable the Biometric authentication toggle.

Launch the Play Store app and tap on your profile picture.

Tap on Payments and subscriptions.

Select Redeem code and type in the code found on your gift card.

How to update your apps and games using the Google Play Store

To ensure you get new features and bugfixes for the apps you already own, you have to update them.

Updating apps manually

Launch the Google Play Store app and tap on your profile icon. Select Manage apps and device option and tap on Updates available. Alternately you can choose Update all to update everything sight unseen, but you might want to be more selective if time and/or bandwidth is at a premium.


Launch the Play Store app tap your profile icon.

Tap on Manage apps and device.

Select Updates available.

Tap on Update next to each app, or else use Update all to speed up the process.

Updating apps automatically

The alternative is for your device to update apps and games automatically, which is usually done while charging. To enable this option, tap on your profile icon, then Settings, and select Network preferences. Hit Auto-update apps and pick your preference.


Tap on your profile icon and select Settings.

Tap on Network preferences.

Select Auto-update apps and pick your preference.

Launch the Play Store app and tap on your profile icon.

Select Manage apps and device.

Tap on Manage.

Check the app(s) you want to uninstall.

Tap the trashcan button to delete the selected apps.

There can be various reasons why the Google Play Store may not be working, such as a poor internet connection, an outdated Play Store app, caching or data issues, or even a problem with your Google account. See our guide for some possible fixes.

The Play Store app is typically pre-installed on Android devices. If your device doesn’t have it or you accidentally uninstalled it, you can download and install the app by visiting the Play Store website and downloading the APK file. Before downloading, enable the “Unknown sources” option in your device’s settings to allow installation from sources other than the Play Store.

We don’t recommend uninstalling the Play Store app as it’s an essential part of the Android ecosystem. However, you can disable it if you don’t want to use it. To disable the app, go to your device’s settings, select Apps and notifications, find and select the Google Play Store app, and tap Disable.

The Google Play Store is the primary app store for Android devices. There are others, such as the Amazon Appstore, but they serve niche purposes.

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