Persistent Systems Senior Python Developer Interview Questions and Answers

Q1. How you will scale your existing in use database? What are the types of scaling? How flask handles multiple requests?
Ans. 
Scaling a database involves horizontal or vertical scaling, with types including sharding, replication, and partitioning. Flask handles multiple requests using a WSGI server like Gunicorn.
• Types of scaling include horizontal scaling (adding more servers), vertical scaling (upgrading server resources), sharding (splitting data across multiple servers), replication (copying data to multiple servers), and partitioning (div...read more
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Q1. Basic questions on python programming and problem solving. 1. decorators, code optimization, multithreading, multiprocessing, GIT..etc. 2. Basic problem solving ability.
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Q1. Questions on past experience.
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Q1. Tell me about yourself
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Q2. Project architecture
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Q3. Sns vs SQS architecture
Ans. 
SNS is a pub/sub messaging service while SQS is a message queue service in AWS architecture.
• SNS allows for push notifications to multiple subscribers, while SQS is used for decoupling services and handling asynchronous tasks.

• SNS is used for real-time messaging and event-driven architecture, while SQS is used for reliable message processing and scaling.

• SNS supports multiple message delivery protocols like HTTP, HTTPS, E...read more
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Q4. S3 file parking and triggers
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Q5. Explain Eventbridge
Ans. 
Eventbridge is a serverless event bus service provided by AWS for connecting applications using events.
• Eventbridge allows different AWS services, SaaS applications, and custom applications to communicate with each other through events.

• It simplifies the process of building event-driven architectures by decoupling producers and consumers of events.

• Eventbridge can be used to trigger automated workflows, connect different ...read more
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Q1. Print words which length has even number from sentences
Ans. 
Print words with even length from sentences
• Iterate through each word in the sentence

• Check the length of the word using len() function

• If the length is even, add the word to a new list

• Return the list of words with even length
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Q2. Print string is symmetrical or not also string is palindrome or both
Ans. 
Check if a string is symmetrical, palindrome, or both.
• Check if the string is equal to its reverse to determine if it is a palindrome.

• Check if the string is equal to its mirror image to determine if it is symmetrical.

• A string that is both a palindrome and symmetrical is one that reads the same forwards and backwards.
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Based on list, then Selenium x path

Q1. Basics of python
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Q2. Basic of selenium theory questions
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Q1. She asking Work experience related and expected CTC etc.
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Q2. Your resume is shortlisted then call back you.
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Q1. Questions related to python web framework
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Q2. Real time python project problem solving questions
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