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How to Create a Symmetric Array in Python

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 Here's a Python program that says to write a Symmetric array transformation. A top interview question. Symmetric Array Transformation Problem: Write a Python function that transforms a given array into a symmetric array by mirroring it around its center. For example: Input: [1, 2, 3] Output: [1, 2, 3, 2, 1] Hints: Use slicing for the reverse part. Concatenate the original array with its mirrored part. Example def symmetric_array(arr):     """     Transforms the input array into a symmetric array by mirroring it around its center.     Parameters:     arr (list): The input array.     Returns:     list: The symmetric array.     """     # Mirror the array by concatenating the original with its reverse (excluding the last element to avoid duplication)     return arr + arr[-2::-1] # Example usage input_array = [1, 2, 3] symmetric_result = symmetric_array(input_array) print("Input Array:", input_arr...
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9 Top AWS Services a Quick List

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In this post, I have explained the top AWS services list. These services are useful to read before your next interview. knowing this list is a must for all cloud-computing engineers. AWS provides various services. This post gives a clear understanding of AWS's top services. 

AWS Books

Not only for traditional services, but it also offers services for Mobile IoS and Android Os. Aws Service catalog helps organizations to manage their IT services.


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List of Top AWS Services Quick List


These 9 Services of AWS are popular. I have explained each service to understand quickly.

  1. EC2
  2. Lambda
  3. S3
  4. DynamoDB
  5. IAM
  6. Amazon Cognito
  7. Device Farm
  8. Mobile analytics
  9. SNS

1. AWS EC2 Instance

  • EC2: Amazon Elastic Compute Cloud (EC2) provides secure, scalable, on-demand hardware virtualization in the cloud.
  • Using Amazon EC2 eliminates the need to invest in server hardware upfront so that users can focus on, develop, and deploy applications faster. 
  • EC2 instances come in various hardware configurations and include an operating system.

2. Lambda Function in AWS

  • AWS Lambda lets users run snippets of code without provisioning infrastructure. 
  • This service is billed on a pay-as-you-go model, with users only paying for the execution time of their lambda code. 
  • There is no charge when the code is not running. Lambda code can be set up to automatically trigger from other AWS services or called directly from any web or mobile app.

3. Aws S3 Console

Amazon Simple Storage Service is a secure, durable, and scalable cloud-based object-store. Using this service, you can store your files in the cloud.

4. DynamoDB

Amazon DynamoDB is a high-performance, scalable cloud-based NoSQL database service.

5. Aws IAM Role

Amazon Identity and Access Management (IAM) lets you securely control who can access your AWS resources, what resources they can access, and what they can do with these resources.

6. Amazon Cognito Review

  • Amazon Cognito allows you to create identity profiles for your app's users and allows them to sign in to the app with their Amazon, Facebook, Twitter, or Google accounts.
  • After users have authenticated from the app, the app is given a token that can be used to access AWS cloud resources securely. 
  • Amazon Cognito also offers a service that allows authenticated users to sync their app data on different devices.

7. Aws Device Farm

  • Amazon Device Farm is an app testing service that allows you to upload your app and run a set of automated tests and a set of real-time tests on physical devices hosted by Amazon.
  • Both Android and iOS apps are supported.

8. Aws Mobile Analytics

  • Amazon Mobile Analytics allows you to collect and visualize app usage data. A set of reports is generated based on the collected data. 
  • You can export the analytics data to other AWS cloud services for further processing.

9. Aws SNS topic

  • Amazon Simple Notification Service (SNS) enables you to send push messages.
  • These messages can be pushed to mobile applications, e-mail inboxes, web servers, and other AWS cloud services.
  • SNS supports various protocols including SMS, e-mail, and HTTP/S.

Summary

A total of nine AWS services absolutely need for every developer working on AWS.


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