Tiger Analytics Machine Learning and Python Developer Interview Questions and Answers

Q1. Shifts the zeros to right
Ans. 
Shift all zeros in an array to the right while maintaining the order of non-zero elements.
• Iterate through the array and move all non-zero elements to the front of the array.

• Fill the remaining elements with zeros.

• Maintain the relative order of non-zero elements.
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Q2. What is decorator?
Ans. 
A decorator is a design pattern in Python that allows adding new functionality to an existing object without modifying its structure.
• Decorators are denoted by the @ symbol followed by the decorator function name.

• They are commonly used to modify or extend the behavior of functions or methods.

• Decorators can be used for logging, timing, authentication, caching, etc.

• Example: @staticmethod, @classmethod, @property
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Q1. Past project related questions
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Q2. Python and sql queries
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Simple python programming concepts

Q1. Basic System design of inter service communication in transactional systems.
Ans. 
Inter service communication in transactional systems involves designing a reliable and efficient way for services to communicate and exchange data.
• Use asynchronous messaging systems like RabbitMQ or Kafka to decouple services and ensure reliable message delivery.

• Implement RESTful APIs for synchronous communication between services, using HTTP methods like GET, POST, PUT, DELETE.

• Consider using gRPC for high-performance,...read more
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Q2. Loading and processing a file with huge data volume
Ans. 
Use pandas library for efficient loading and processing of large files in Python.
• Use pandas read_csv() function with chunksize parameter to load large files in chunks.

• Optimize memory usage by specifying data types for columns in read_csv() function.

• Use pandas DataFrame methods like groupby(), merge(), and apply() for efficient data processing.

• Consider using Dask library for parallel processing of large datasets.

• Use gen...read more
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Q1. What is List Comprehension
Ans. 
List comprehension is a concise way to create lists in Python by iterating over an existing list or iterable.
• Syntax: [expression for item in iterable]

• Can include conditions: [expression for item in iterable if condition]

• Can be nested: [[i*j for j in range(1, 4)] for i in range(1, 4)]

• Can be used to create new lists from existing lists efficiently
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Q2. What are the types of Serializers in Django
Ans. 
Types of Serializers in Django include ModelSerializer, Serializer, and HyperlinkedModelSerializer.
• ModelSerializer: Used to serialize Django model instances.

• Serializer: Generic serializer class for custom data serialization.

• HyperlinkedModelSerializer: Includes hyperlinks to related resources in the serialized data.
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Q1. Create linkedList
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Create a LinkedList class with methods like insert, delete, search

• Example: Node class - class Node: def __init__(self, data): self.data = data self.next = None
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Q2. Basic to advance python
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