Amazon Cognito is an Amazon Web Services product which controls the user authentication and access for mobile applications on internet-connected devices. This service helps to speed-up the application development by saving and synchronizing end user’s data, allowing an application developer to focus on writing code instead of building and managing the requisite back-end infrastructure. Explore this article and know what is it about and it’s features.



A developer can create and maintain a user directory and can add sign-up and sign-in to the user’s mobile application or web application using Amazon Cognito User Pools. User pools scale up-to hundreds of millions of users and can provide simple, secure, and low-cost options for the developer.

The developer can also implement enhanced security features, such as email and phone number verification, and multi-factor authentication. In addition, Amazon Cognito User Pools lets the developer customize the workflows through AWS Lambda.


Amazon Cognito Federated Identities enables the developer to create unique identities for their users and authenticate them with federated identity providers. With a federated identity, a developer can obtain temporary or limited-privilege using AWS credentials to synchronize the data with Amazon Cognito Sync or to securely access other AWS services such as Amazon DynamoDB, Amazon S3, and Amazon API Gateway. Amazon Cognito Federated Identities supports federated identity providers which include Amazon, Facebook, Google, Twitter, OpenID Connect providers, and SAML identity providers and as-well-as unauthenticated identities. This feature also supports the developer authenticated identities, which allows to register and authenticate users through their own back-end authentication systems.


Amazon Cognito Sync is an AWS service that supports offline access and cross-device syncing of application-related to user’s data. The developer can use Amazon Cognito Sync to synchronize the user’s profile data across mobile devices and the web without requiring the user’s own back end.


Create and maintain a user directory and add sign-up and sign-in to the user mobile app or web application using user pools. The user can use user pools to add user registration and sign-in features to your apps. Instead of using external identity providers such as Facebook, Google, or Twitter, a developer can also use user pools to let the users register with a sign-in to an app using an email address, phone number, or a user name. The user can also create custom registration fields and can store the metadata in their user directory. Users can verify their email addresses and phone numbers, recover passwords and can enable multi-factor authentication (MFA) with just a few lines of code.

User pools are for mobile and web application developers who want to handle user registration and can sign-in directly in their apps. Previously, a developer needed to implement their own user directory to create user accounts, store user profiles, and implement password recovery flows to support user registration and sign-in.

User pools integrate easily with the existing Amazon Cognito functionality for anonymous and social identities. In addition to that, a user can start as an anonymous user and then either sign in using a social identity or using user pools to register and sign in using email, phone number, or username.


What is the use of Bootstrap Carousel plugin?

The Carousel plugin is used to add a slider to your site. It is useful in condition where you want to display huge amount of content within a small space on the web pages. Some of the standard carousel includes

.carousel (options)
.carousel (‘cycle’)
.carousel (‘pause’)
.carousel (‘number’)
.carousel (‘prev’)
.carousel (‘next’)


What is the difference between Memcache and Memcached?

Memcache: It is an extension that allows you to work through handy object-oriented (OOP’s)
and procedural interfaces. It is designed to reduce database load in dynamic web applications.

Memcached: It is an extension that uses libmemcached library to provide API for
communicating with Memcached servers. It is used to increase the dynamic web applications by
alleviating database load. It is the latest API.


Explain how Memcached should not be used?

  • Memcached common misuse is to use it as a data store, and not as a cache.
  • Never use Memcached as the only source of the information you need to run your application. Data should always be available through another source as well.
  • Memcached is just a key or value store and cannot perform query over the data or iterate over the contents to extract information.
  • Memcached does not offer any form of security either in encryption or authentication.


Aws Mobile Hub

Aws Mobile Hub

AWS is providing a range of services to help the user to develop mobile applications that can scale up to hundreds of millions of users and can reach global audiences. With AWS the user can get started quickly, it ensures high quality by testing on real devices in the cloud, and measures and improves the user engagement. So let’s dive deep and know what is AWS Mobile Hub and setting-up of a mobile hub.

What exactly the AWS Mobile Hub is :

AWS Mobile Hub provides an integrated console experience that enables the user to swiftly create and configure powerful mobile app backend features and integrate them into their mobile app. The user can create a project by selecting the features to add to their application.

When the user builds her project for iOS Objective-C, iOS Swift, or Android, Mobile Hub automatically provisions and configures all of the AWS service resources that the app’s features require. Mobile Hub then guides the user through integrating the features into the user app code and downloading a fully working quick start app project that demonstrates the features.

After the mobile app is built, the user can use Mobile Hub to test the app, then monitor and visualize how it is being used.

AWS Mobile Hub enables the user to select the region in which their project’s resources will be created.

When the user uses AWS Mobile Hub, the user can pay only for the underlying services that Mobile Hub provisions based on the features they have chosen in the Mobile Hub console.

Setting-up AWS Mobile Hub:
Sign-up for AWS

To use AWS Mobile Hub, the user needs an account in AWS. The user account will have the access to all available services, but the users are charged only for the services they use. If the user is a new AWS customer, they can get started with the AWS Free Tier.

Creating an I am user

To provide better security, the user is recommended to not to use their AWS root account to access the Mobile Hub. Instead of that, the user can create an AWS Identity and can Access Management (IAM) user, or can use an existing IAM user, in their AWS account and then access Mobile Hub. If the user has already signed up for AWS but has not created an IAM user for themselves, they can create one by using the IAM console. First, they have to create an IAM administrator group, then create and assign a new IAM user to that group.

Enabling AWS Mobile Hub

AWS Mobile Hub administers AWS resources for mobile app projects on behalf of the customer. This includes the automation that creates AWS Identity and Access Management roles to the mobile app users and updates their permissions based on the features that are enabled in a mobile app project. Because these operations require administrative privileges, then only a user with administrative privileges may enable to Mobile Hub too. These are the steps an administrative user must take in order to enable AWS Mobile Hub in an AWS account. This only needs to be done once.

To enable Mobile Hub in an AWS account:

  • Navigate to the AWS Mobile Hub console at
  • Select Get Started.
  • Select Yes, grant permissions.

Signing in to Mobile Hub and Creating the user’s Project:

A Mobile Hub project is a logical workspace which contains the features which the user chooses to incorporate into their mobile app. The user can create as many projects as they wish.

To create a Mobile Hub project

  • Select Get Started or Create new project.
  • For Project name, type a name for the project.
  • Select Create project.

Getting Started:
App Content Delivery:

The App Content Delivery feature enables the user to store app assets, such as resource or media files, so that a user can download and cache them within their app. Mobile Hub offers two choices for distributing these files: 1. from a single location using an Amazon S3bucket or 2.
distributed through a global content delivery network by using Amazon CloudFront.

Cloud Logic

The Cloud Logic feature lets the user to build backend services using AWS Lambda functions that the user can call from their mobile app. Using Cloud Logic, a user can run code in the cloud to process business logic for their apps and share the same code for both iOS and Android apps. The Cloud logic feature is powered by AWS Lambda functions, which allows the user to write code without worrying about managing frameworks and scaling backend infrastructure.

Push Notifications

The Push Notifications feature enables the user to send push notification messages to their iOS and Android apps using Amazon Simple Notification Service. The user can integrate with Apple and Google messaging services by providing credentials that are provided by those services. They can send messages directly to individual devices, or publish messages to the SNS topics.

User Data Storage

The Mobile Hub User Data Storage feature, creates and configures four folders for each user, inside an Amazon S3 bucket belonging to the app. The following table shows the details of permission policies that are provisioned for each folder type.

user data storage
The Verdict

With Mobile Hub and the creations of a Mobile Hub project, Mobile Hub allows the user to return and modify its features and configurations. With all these features available, combined with AWS services, client SDKs, and code makes it fast and easy to add new capabilities to the user mobile App. With the fast turnaround of information, whether it is social, media or business, AWS Mobile Hub provides an ideal platform for mobile apps and services to work seamlessly together.



Top 3 Python IDE

Smart programmers not only code well but also do it in style. And to become a good programmer may take longer time than you expect. However, if you choose the best Python IDE, then one can certainly reduce their coding efforts. IDLE is the Python IDE that comes with the standard Python package. It allows quick editing and execution of Python scripts. However, it lacks a lot of features that can increase speed and boost productivity.

Picking up the right IDE is crucial as it can help the programmer to automate a lot of tasks and ease up project management. So, the developer must wisely choose a development tool, that the developer shouldn’t regret using it later in the project lifecycle.

There is a number of factors that the developer might like to consider for shortlisting. We have mentioned few points to make an entry-level distinction:

  • An ideal Python IDE should support multiple platforms such as Windows, Linux, and MacOS.
  • Check if it is available for free or is an open source with a GPL license.
  • Also, confirm if the IDE has a community version which suits students and beginners who are learn ing Python.

IT companies or the professionals working with big organizations might have access to paid version of commercial IDEs. Just to name a few are Komodo, PyCharm, Sublime, and Wing IDE.

In this article, we have published 3 best python IDE’s voted as most advanced and feature rich by experienced and professional programmers.


PyCharm is a complete Python IDE loaded with a rich set of features. It is the software company, JetBrains, which is behind the development of PyCharm. And it has left no stone unturned in making this tool up to date while meeting the increasing needs of Python developers.

It is an enterprise-level product which offers two variations – the first is community edition, free for non-commercial usage and next is the premium version for advanced as well as enterprise users.

For basic users, the free version is enough to start their work. It includes almost every feature the developer might seek in an IDE – Auto code completion, quick project navigation, built-in version control support, code inspection/refactoring, PEP8 quality audit, fast error checking and correction, UI level debugging, and integrated AUT testing. The other key features include integration with IPython notebook and support for Anaconda as-well-as packages like NumPy and MatPlotLib for scientific computing.

High-level features such as remote development support, database accessibility, and ability to use extensible web development frameworks (WDF) exist only in the premium version of PyCharm.

Most of the developers say it as the best Python IDE because of its sheer scale to work with a number of WDFs like Django, Web2Py, GAPP, Flask, and Pyramid. Undoubtedly, it is one of the best IDEs for creating small to large scale web applications.


Eric is an open-source Python IDE written using Python and QT frameworks. Its name is derived from Monty Python’s Eric Idle. Despite being a non-commercial product, it has all the features needed for a professional software development.

The creator of Eric is Detlev Offenbach, a senior system engineer from Munich. He has been maintaining it from so many years so that it can compete with any of its peers. Talking about its usage and downloads, it is incomparable. The IDE is available under the GPL license for the unlimited usage.

Eric has a robust plugin manager which you can use to extend the functionality by adding appropriate plugins. The latest and stable version is Eric6 built on PyQt5/4 and Python2/3.

Some of the standard features of Eric are code completion, bracket matching, call tips, syntax highlighting, class browser, code profiling, and integrated unit tests. Developers can also make use of its form preview function while working on a QT GUI application. Below is the list that makes Eric stands against competitors like PyCharm/Wing.

  • Integrated debugger support for multithreaded or multiprocessing applications.
  • Automatic code checkers.
  • Intuitive project management.
  • Built-in Unitest support.
  • Inbuilt Python shell.
  • Addons for Regex and QT dialogs.
  • Integrated web browser.


WING is also one of the top IDE alternatives for Python developers. It is a paid solution from WingWare. The company made huge investments in Wing and added many new and relevant features. Also, it has released a number of updates over the years.

Like PyCharm, Wing also supports Windows, Linux, and Mac OS X. The company offering three types of packages; a Freeware with moderate features, a personal version for individual users, and a high-end edition for the enterprise users.

WING Python IDE is an intelligent code editor and a great debugging tool. Both these features together make Python coding easy, interactive, accurate, and fast. It has a robust graphical debugger which enables to set breakpoints, navigating through code, monitoring data, multi-process/multi-threaded code debugging and also supports remote debugging on SOC (System On Chip) devices such as Raspberry PI. Also, it comes with the ability to blend with different version control systems such as GIT, CVS, SVN, Mercurial, and Perforce. So the developers can perform check-in/check-out and manage merge within the IDE.

WING team ensured that the IDE supports all the major Python frameworks available as of today. Just to name a few of these frameworks are PyQT, PyGTK, PySide, Zope, MotionBuilder, Django, and much more. It also supports Matplotlib where the plots get updated automatically.