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DataTerrain Python and Django Developer Interview Questions and Answers
9 Interview questions
To fetch API data in Django from server using params dynamically.
Use Django's HttpRequest object to access query parameters
Extract the query parameter value using request.GET.get('querydata')
Use the extracted value to dynamically fetch data from the server
Class-based views are based on classes and provide more structure and functionality, while function-based views are based on functions and are simpler and more flexible.
Class-based views are defined as classes and inherit from Django's generic view classes, providing built-in functionality such as mixins and decorators.
Function-based views are defined as functions and are more flexible, allowing for custom logic a...
To revert changes made in Django migrations, use the command 'python manage.py migrate <app_name> <migration_name>'.
Use the command 'python manage.py showmigrations' to list all migrations and their names.
Identify the migration name you want to revert (e.g., 'app_name', '0002_migration_name').
Run the command 'python manage.py migrate <app_name> <migration_name>' to revert the specific migra...
Message queues and caching systems are used to improve performance and scalability in web applications.
Message queues help in decoupling components by allowing asynchronous communication between them.
Caching systems store frequently accessed data in memory to reduce database load and improve response times.
Popular message queue systems include RabbitMQ, Kafka, and Redis.
Common caching systems include Memcached and...
Custom middleware in Django allows for processing requests and responses before reaching views.
Custom middleware is a Python class that defines methods to process requests and responses in Django.
To create custom middleware, define a class with methods like process_request, process_response, etc.
Register the custom middleware in the Django settings.py file under the MIDDLEWARE key.
Example code: class CustomMiddlew...
SQL Procedures are stored SQL code that can be executed on demand. Triggers are special types of stored procedures that are automatically executed when certain events occur.
SQL Procedures are reusable blocks of SQL code that can be called by other programs or scripts.
Triggers are special types of stored procedures that are automatically executed when specific events occur in the database.
Triggers are commonly used...
Django supports multiple databases through its database router feature.
Django allows defining multiple database connections in settings.py
Use database routers to route specific models to different databases
Example: routing user data to a separate database for better performance
REST API is a set of rules and conventions for building and interacting with web services.
REST stands for Representational State Transfer
Methods available in REST API are GET, POST, PUT, DELETE
GET - Used to retrieve data from a server
POST - Used to send data to a server to create a new resource
PUT - Used to update an existing resource on the server
DELETE - Used to remove a resource from the server
Example: GET requ...
Decorators in Django are used to modify the behavior of functions or methods. @login_required ensures user authentication, while @permission_required checks for specific permissions.
Decorators are functions that wrap another function to modify its behavior.
@login_required decorator ensures that the user is authenticated before accessing a view.
@permission_required decorator checks if the user has specific permissi...
DataTerrain Python and Django Developer Interview Experiences
1 interview found
Anonymous
I applied via LinkedIn and was interviewed in Dec 2024. There was 1 interview round.
(9 Questions)
- Q1. How to use decorator and explain the difference between @login_required and @permission_required in Django?
- Ans.
Decorators in Django are used to modify the behavior of functions or methods. @login_required ensures user authentication, while @permission_required checks for specific permissions.
Decorators are functions that wrap another function to modify its behavior.
@login_required decorator ensures that the user is authenticated before accessing a view.
@permission_required decorator checks if the user has specific permissions b...
- Q2. How to revert the previous changes made on the database server in Django i.e., Migration A, B, C, D you are now ready with new changes as E but need to revert the changes B?
- Ans.
To revert changes made in Django migrations, use the command 'python manage.py migrate <app_name> <migration_name>'.
Use the command 'python manage.py showmigrations' to list all migrations and their names.
Identify the migration name you want to revert (e.g., 'app_name', '0002_migration_name').
Run the command 'python manage.py migrate <app_name> <migration_name>' to revert the specific migration.
- Q3. How to fetch API data in Django from server using params and it can fetch data dynamically i.e., -----/?querydata=seetha, here the query data may be a username, email, mobile number, register number, regis...
- Ans.
To fetch API data in Django from server using params dynamically.
Use Django's HttpRequest object to access query parameters
Extract the query parameter value using request.GET.get('querydata')
Use the extracted value to dynamically fetch data from the server
- Q4. What is difference between Class-based views and function-based views?
- Ans.
Class-based views are based on classes and provide more structure and functionality, while function-based views are based on functions and are simpler and more flexible.
Class-based views are defined as classes and inherit from Django's generic view classes, providing built-in functionality such as mixins and decorators.
Function-based views are defined as functions and are more flexible, allowing for custom logic and co...
- Q5. What are SQL Procedures and Triggers, when the triggers are used?
- Ans.
SQL Procedures are stored SQL code that can be executed on demand. Triggers are special types of stored procedures that are automatically executed when certain events occur.
SQL Procedures are reusable blocks of SQL code that can be called by other programs or scripts.
Triggers are special types of stored procedures that are automatically executed when specific events occur in the database.
Triggers are commonly used for ...
- Q6. How to handle the different type of databases in Django? Have you done before in your projects?
- Ans.
Django supports multiple databases through its database router feature.
Django allows defining multiple database connections in settings.py
Use database routers to route specific models to different databases
Example: routing user data to a separate database for better performance
- Q7. How the REST API works and what are the methods are available and explain?
- Ans.
REST API is a set of rules and conventions for building and interacting with web services.
REST stands for Representational State Transfer
Methods available in REST API are GET, POST, PUT, DELETE
GET - Used to retrieve data from a server
POST - Used to send data to a server to create a new resource
PUT - Used to update an existing resource on the server
DELETE - Used to remove a resource from the server
Example: GET request t...
- Q8. What is custom middleware, how to create and explain with example code?
- Ans.
Custom middleware in Django allows for processing requests and responses before reaching views.
Custom middleware is a Python class that defines methods to process requests and responses in Django.
To create custom middleware, define a class with methods like process_request, process_response, etc.
Register the custom middleware in the Django settings.py file under the MIDDLEWARE key.
Example code: class CustomMiddleware: ...
- Q9. What is the mechanism for utilizing message queues and caching systems?
- Ans.
Message queues and caching systems are used to improve performance and scalability in web applications.
Message queues help in decoupling components by allowing asynchronous communication between them.
Caching systems store frequently accessed data in memory to reduce database load and improve response times.
Popular message queue systems include RabbitMQ, Kafka, and Redis.
Common caching systems include Memcached and Redi...
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
I appeared for an interview in Nov 2020.
(2 Questions)
Round duration - 120 minutes
Round difficulty - Medium
This was an online coding, mcq and debugging round round held on Amcat platform, there were 3 sections in the test.
1)20 MCQ questions {10 involving mathematics and the other 10 on programming fundamentals}; duration:20 mins;
you cannot navigate back to a questions after moving further, so have to answer carefully
2)debugging section- it involved 7 questions which were to be completed within 20 mins, 5 of them were very easy, each question only took almost a minute to figure out the problem with the code, last 2 questions were relatively moderate and there were errors at 3-4 sections of the entire code. I was able to solve all the questions in 15 mins
3)2 Coding questions- duration:80 mins, one was moderate on string while the other one involved dynamic programming, I was able to successfully execute all the available test cases.
- Q1.
Smallest Window Problem Statement
Given two strings,
SandX, your task is to find the smallest substring inSthat contains all the characters present inX.Example:
Input:
S = "abdd", X = "bd"
Outpu...
- Ans.
Find the smallest substring in S that contains all characters in X.
Use a sliding window approach to find the smallest window in S containing all characters of X.
Maintain a hashmap to keep track of characters in X and their frequencies.
Slide the window by moving the right pointer until all characters in X are found, then move the left pointer to minimize the window size.
Return the smallest window found.
Example: S = 'abd...
- Q2.
Minimum Sum in Matrix Problem Statement
You are given a 2D matrix 'ARR' of size 'N x 3' with integers, where 'N' is the number of rows. Your task is to compute the smallest sum achievable by selecting one...
- Ans.
Find the smallest sum achievable by selecting one element from each row of a 2D matrix, following certain constraints.
Iterate through each row and find the minimum element that does not violate the constraints.
Keep track of the minimum sum achieved by selecting elements from each row.
Avoid selecting elements directly beneath previously selected elements.
(1 Question)
Round duration - 45 minutes
Round difficulty - Hard
The interview started with introduction, there were two interviewers, they both introduced themselves and then asked me to introduce myself. Then we had a brief description on my projects, and they really appreciated my projects. Then as they were more concerned with DSA part, so we moved towards solving a coding problem. It was a famous rotten oranges problem with some change in language but as I haven't seen it beforehand, I wasn't able to give them an optimal approach and had to ask for some hints, but with a certain amount of help and hints, I was able to solve the problem and successfully coded it in 5 mins. Then the interviewers went for a dry run of the algorithm and tried to run it on each and every corner case, but as my algorithm was kind of bullet proof, it successfully passed all the corner cases.
Then they went for some questions on OOPS concepts involving inheritance and we had a long discussion on virtual function and runtime polymorphism. Then the interview was ended after a Q/A round that lasted for 3-4 minutes.
- Q1.
Rotten Oranges Problem Statement
Given a grid containing oranges in three possible states:
- Value 0 - Empty cell
- Value 1 - Fresh orange
- Value 2 - Rotten orange
Every second, any fresh orange adjac...
- Ans.
Given a grid with fresh and rotten oranges, determine the minimum time for all oranges to become rotten.
Create a queue to store the coordinates of rotten oranges and perform BFS to rot adjacent fresh oranges
Track the time taken to rot all oranges and return -1 if some fresh oranges remain
Handle edge cases like empty grid or no fresh oranges present
Example: For input grid = [[2,1,1],[1,1,0],[0,1,1]], the minimum time to...
Interview Preparation Tips
Tip 1 : Try to keep yourself involved in competitive programming on regular basis {ex-Codechef, codeforces etc}
Tip 2 : brush up concepts on DSA and practice at least all questions from interviewbit and around 300 questions from GFG and Leetcode of upto intermediate level, this will help you in building your concepts and you will be quickly able to answer the questions in face to face interviews
Tip 3 : Complete some courses on data structures and algorithms and some programming languages{coding ninjas courses are preferable for valuable content}
Tip 1 : Try to keep only those things in resume on which you have very good command and you should be able to answer all of the questions(upto moderate level) related to your technical skills
Tip 2 : Mention your projects with brief description, try avoiding very high level description because some times reader might not be able to understand your work, keep it descriptive and understandable
Skills evaluated in this interview
I appeared for an interview in Oct 2020.
(2 Questions)
Round duration - 120 minutes
Round difficulty - Medium
Evening test around 5
Platform :- SHL
Environment was amazing
- Q1.
Subtree of Another Tree Problem Statement
Given two binary trees, T and S, determine whether S is a subtree of T. The tree S should have the same structure and node values as a subtree of T.
Explanation:
... - Ans.
Given two binary trees T and S, determine if S is a subtree of T with the same structure and node values.
Check if the second tree is a subtree of the first tree by comparing their structures and node values.
Use a recursive approach to traverse both trees and check for equality.
Handle cases where one tree is null or the values do not match.
Return true if S is a subtree of T, false otherwise.
- Q2.
Search in a Row-wise and Column-wise Sorted Matrix Problem Statement
You are given an N * N matrix of integers where each row and each column is sorted in increasing order. Your task is to find the positi...
- Ans.
Given a sorted N*N matrix, find the position of a target integer X.
Iterate over each row and column to find the target integer X
Utilize the sorted nature of the matrix to optimize the search process
Return the position of X if found, else return -1 -1
(2 Questions)
Round duration - 60 minutes
Round difficulty - Medium
1 Hour
Afternoon
- Q1.
Intersection of Linked List Problem
You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.
Your task is to determine t...
- Ans.
Find the node where two linked lists merge, return -1 if no merging occurs.
Traverse both lists to find their lengths and the difference in lengths
Move the pointer of the longer list by the difference in lengths
Traverse both lists simultaneously until they meet at the merging point
- Q2.
Problem: Pair Sum in a Binary Search Tree
Given a Binary Search Tree (BST) and an integer 'S', your task is to find all pairs of nodes within the BST that total to 'S' and return these pairs. If no such p...
- Ans.
Find pairs of nodes in a BST that sum up to a given value 'S'.
Traverse the BST in-order to get a sorted list of nodes.
Use two pointers approach to find pairs with sum 'S'.
Keep track of visited nodes to avoid using the same node twice in a pair.
(2 Questions)
Round duration - 60 minutes
Round difficulty - Medium
Online Round held on Chime
- Q1.
Is Binary Heap Tree Problem Statement
You are given a binary tree of integers. Your task is to determine if it is a binary heap tree or not.
Input:
The first line of input contains an integer ‘T’ denoti... - Ans.
Determine if a given binary tree is a binary heap tree or not based on certain properties.
Check if the binary tree is a complete binary tree where every level, except the last level, is completely filled and the last level is as far left as possible.
Ensure that every parent node is greater than all its children nodes, forming a max-heap.
If any node does not have a left or right child, it should be represented as -1 in ...
- Q2.
Edit Distance Problem Statement
Given two strings
SandTwith lengthsNandMrespectively, your task is to find the "Edit Distance" between these strings.The Edit Distance is defined as the minimum nu...
- Ans.
The task is to find the minimum number of operations required to convert one string into another using delete, replace, and insert operations.
Use dynamic programming to solve the problem efficiently.
Create a 2D array to store the edit distances between substrings of the two input strings.
Fill up the array based on the minimum of three possible operations: insert, delete, or replace.
The final answer will be the value at...
Interview Preparation Tips
Tip 1 : 1 Programming Language
Tip 2 : Practice Data Structures with atleast 300 ques.
Tip 3 : CS Fundamental
Tip 1 : 1 Pager
Tip 2 : Add top 3 projects in Resume.
Skills evaluated in this interview
I applied via LinkedIn and was interviewed in Nov 2021. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. Generics in Java
- Ans.
Generics in Java allow for type safety and reusability of code.
Generics allow for the creation of classes, interfaces, and methods that can work with any data type.
They provide compile-time type safety, preventing runtime errors.
Examples include ArrayList
, HashMap . Wildcards can be used to allow for flexibility in generic types.
Generics can improve code readability and reduce the need for casting.
Ge...
Interview Preparation Tips
Skills evaluated in this interview
I appeared for an interview before Sep 2020.
(2 Questions)
Round duration - 90 Miinutes
Round difficulty - Medium
First round had MCQ + 2 coding questions. It was held in morning around 11 am. It was held on campus.
- Q1.
Robot Delivery Path Problem
You are tasked with directing a robot from the top-left corner of an N*N matrix to a specified point (x, y), delivering a parcel. The robot is restricted to move only on flat a...
- Ans.
Determine if a robot can reach a specified destination in a matrix by moving only downwards or rightwards.
Start at (0,0) and move towards the destination (x, y) only downwards or rightwards.
Check if the path is clear (1) and avoid obstacles (0) while staying within matrix boundaries.
Return true if the robot can reach the destination, false otherwise.
Example: For input matrix [[1, 0, 1], [1, 1, 1], [1, 1, 5]] with desti...
- Q2.
Unique Element in Array
Given an arbitrary array
arrconsisting ofNnon-negative integers where every element appears thrice except for one. Your task is to find the element in the array that appears onl... - Ans.
Find the unique element in an array where every element appears thrice except for one.
Use XOR operation to find the unique element.
Iterate through the array and XOR each element to find the unique element.
The XOR operation cancels out elements that appear thrice, leaving only the unique element.
Example: arr = [2, 2, 3, 2], XOR of all elements = 3.
Example: arr = [0, 1, 0, 1, 0, 1, 99], XOR of all elements = 99.
(2 Questions)
Round duration - 90 Minutes
Round difficulty - Medium
Second Round was held in morning around 10-11 am. There was one interviewer working on his laptop. Interviewer was really helpful and first offered me water and then for a bit talked about himself.
- Q1.
BST Iterator Problem Statement
You are tasked with implementing a class
BSTIterator, which is designed to traverse a Binary Search Tree (BST) in the inorder manner. The class must support the following op... - Ans.
Implement a BSTIterator class to traverse a Binary Search Tree in inorder manner.
Implement a constructor to initialize the iterator with the root of the BST.
Implement next() and hasNext() methods to traverse the BST in inorder.
Implement prev() and hasPrev() methods to access the previous element in the inorder traversal.
Use level-order traversal format to represent the tree input.
Output the inorder traversal of the bin...
- Q2.
Distance Between Two Nodes in a Binary Tree
Given a binary tree and the values of two distinct nodes, determine the distance between these two nodes in the tree. The distance is defined as the minimum num...
- Ans.
Calculate the distance between two nodes in a binary tree.
Traverse the tree to find the paths from the root to each node
Find the lowest common ancestor of the two nodes
Calculate the distance by adding the distances from the LCA to each node
Interview Preparation Tips
Tip 1 : Keep talking about what are you thinking
Tip 2 : Don't beat about the bush if don't know the answer just say so
Tip 1 : Only show projects you are confident about
Tip 2 : Basic Web and android projects are also fine
Skills evaluated in this interview
Tanay Lakshman
I applied via Referral and was interviewed in Sep 2021. There were 6 interview rounds.
Interview Questionnaire
1 Question
- Q1. Tell us about Reliability?
- Ans.
Reliability refers to the ability of a system or component to perform its required functions under stated conditions for a specified period of time.
Reliability is a measure of how often a system or component fails and how quickly it can be restored to normal operation.
It is important to design systems with redundancy and failover mechanisms to ensure high reliability.
Reliability can be improved through regular maintena...
Interview Preparation Tips
Interview Questionnaire
1 Question
- Q1. Tell me about software system
Interview Questionnaire
2 Questions
- Q1. They asked me on java and I have joined as a fresher they not much questions as I got selected as fresher on oops concepts and collections
- Q2. Please be confident while facing interview and they will check your communication skills
I applied via Recruitment Consultant and was interviewed before Oct 2020. There was 1 interview round.
Interview Questionnaire
2 Questions
- Q1. What is Abstraction
- Q2. Concept of hiding implementation
Interview Preparation Tips
I applied via Monster and was interviewed in Sep 2021. There was 1 interview round.
Interview Questionnaire
2 Questions
- Q1. Tell me a little bit about yourself
- Q2. Which knowledge are you gain your career
Interview Preparation Tips
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