Rajan Kumar
Founder at HackersFriend
India
Python, HTML, CSS, Django, JavaScript, Competitive programming
https://www.hackersfriend.com
@rajan ( Joined 6 years, 5 months ago )
Bio: Rajan is Founder of HackersFriend.
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rajan published an article Jan. 20, 2023 ⋅ 2528 views |
Python - check if a path is file or directory
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rajan published an article Aug. 12, 2020 ⋅ 2077 views |
How to separate Django application config files from code using python decouple
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rajan published an article July 9, 2022 ⋅ 1921 views |
Most common mistakes you should avoid in interviews
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rajan published an article April 3, 2020 ⋅ 6966 views |
How to upload file to SQL server using pyodbc python
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rajan published an article May 9, 2022 ⋅ 2939 views |
Leaky Bucket algorithm for Rate limiting system design
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rajan published an article July 10, 2023 ⋅ 2751 views |
Designing DB schema for efficient pagination
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rajan published an article Aug. 2, 2020 ⋅ 2142 views |
7 Data Science project ideas you can work on to stand out
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rajan published an article Aug. 11, 2020 ⋅ 2796 views |
How to return JSON Encoded response from Django View
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rajan published an article July 10, 2022 ⋅ 2484 views |
How to present your software engineering projects
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rajan published an article April 20, 2020 ⋅ 2330 views |
Advanced python concepts the easy way ( Lambda , Map and Filter )
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rajan published an article Dec. 19, 2020 ⋅ 38780 views |
How to install Python libraries without using the pip command ?
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rajan published an article Aug. 10, 2020 ⋅ 1917 views |
Google off campus drive 2020 for India location
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rajan published an article April 17, 2020 ⋅ 2962 views |
Building a simple To Do list app using HTML CSS Javascript
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rajan published an article April 18, 2020 ⋅ 2296 views |
Using advanced Python concepts the easy way ( List comprehensions and Slicing )
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rajan published an article March 27, 2020 ⋅ 3101 views |
Building a news headlines player using Python and text to speech
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rajan published an article July 4, 2023 (Updated July 4, 2023) ⋅ 2462 views |
Embedding agility in software developments
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rajan published an article Jan. 20, 2023 (Updated Jan. 20, 2023) ⋅ 2931 views |
Python - Raise an exception with message
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rajan published an article April 28, 2022 (Updated April 24, 2022) ⋅ 3141 views |
How to format date output in Linux bash script
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rajan published an article Aug. 30, 2020 (Updated Aug. 30, 2020) ⋅ 2058 views |
5 Analytical skills you must acquire as a data scientist
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rajan published an article July 21, 2020 (Updated July 21, 2020) ⋅ 1895 views |
Handling Exceptions in Python
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rajan published an article May 24, 2020 (Updated May 24, 2020) ⋅ 2319 views |
Automating backup of PostgreSQL database
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rajan published an article May 16, 2020 (Updated May 16, 2020) ⋅ 5102 views |
Building Instagram Profile pic downloader in python
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rajan published an article April 28, 2020 (Updated April 28, 2020) ⋅ 2217 views |
Iteration Protocol and Generators in Python
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rajan published an article April 15, 2020 (Updated April 15, 2020) ⋅ 1677 views |
Why python is so popular despite being slow ?
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rajan published an article April 4, 2020 (Updated April 6, 2020) ⋅ 1610 views |
How to redirect using javascript
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rajan published an article March 29, 2020 (Updated March 30, 2020) ⋅ 3327 views |
How to prepare for Hack With Infy 2020
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rajan published an article March 22, 2020 (Updated March 24, 2020) ⋅ 11693 views |
Filtering empty or NULL values in a Django queryset
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rajan published an article Jan. 25, 2020 (Updated March 9, 2020) ⋅ 1444 views |
forEach() Vs map() in JavaScript - Things every developer should know
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rajan published an article Jan. 23, 2020 (Updated Jan. 16, 2020) ⋅ 1498 views |
Convert a number to a string in C - best way
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rajan published an article Jan. 23, 2020 (Updated Jan. 12, 2020) ⋅ 27136 views |
Building news aggregator web app with Django using python web scraping
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rajan published an article Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 1524 views |
Find Length of a Linked List
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rajan published an article Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 2487 views |
Sort string of characters C++
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rajan published an article Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 1379 views |
Print a matrix in spiral form
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rajan published an article Jan. 23, 2020 (Updated Jan. 6, 2020) ⋅ 1373 views |
Print reverse of a string using recursion
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rajan published an article Jan. 23, 2020 (Updated Jan. 5, 2020) ⋅ 4178 views |
Amazon Product Price tracking using Python
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rajan published an article Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 1551 views |
Program to find the mid-point of a line
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rajan published an article Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 1920 views |
Generate QR Code using python with pyqrcode module
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rajan published an article Jan. 23, 2020 (Updated Dec. 27, 2019) ⋅ 5654 views |
Mouse and keyboard automation using Python
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rajan published an article Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 1156 views |
C++ Trigonometric functions
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rajan published an article Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 2028 views |
Remove one element to maximize XOR of array
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rajan published an article Jan. 23, 2020 (Updated Dec. 6, 2019) ⋅ 1219 views |
Algorithms and Maths you need to know for hard level competitive programming problems
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rajan published an article Jan. 23, 2020 (Updated Dec. 2, 2019) ⋅ 1459 views |
C++ Hacks for Competitive programming
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rajan published an article Jan. 23, 2020 (Updated Nov. 21, 2019) ⋅ 2416 views |
Add two numbers without using arithmetic operators
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rajan published an article Jan. 23, 2020 (Updated Nov. 19, 2019) ⋅ 2835 views |
Efficient Method to Check if a Number is Multiple of 3
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rajan published an article Jan. 23, 2020 (Updated Nov. 18, 2019) ⋅ 1925 views |
DNA to Protein Converter using Python 3 and Django 2.1
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rajan published an article Jan. 23, 2020 (Updated Nov. 16, 2019) ⋅ 2029 views |
Step by step guide to improve competitive programming skills
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rajan published an article Jan. 23, 2020 (Updated Nov. 13, 2019) ⋅ 3066 views |
Implement a Dictionary using Trie
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rajan published an article Jan. 23, 2020 (Updated Oct. 19, 2019) ⋅ 9128 views |
How to prepare for Google Kickstart – a CodeJam competition?
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rajan published an article Jan. 23, 2020 (Updated Sept. 28, 2019) ⋅ 1074 views |
HackersFriend Graduated from Y Combinator's Startup School
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rajan published an article Jan. 23, 2020 (Updated Aug. 17, 2019) ⋅ 1272 views |
Find maximum occurring character in a string
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rajan published an article Jan. 23, 2020 (Updated Aug. 16, 2019) ⋅ 3139 views |
Sort an array without changing position of negative numbers
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rajan published an article Jan. 23, 2020 (Updated Aug. 14, 2019) ⋅ 1700 views |
What is Binary Search Tree (BST) ?
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rajan published an article Jan. 23, 2020 (Updated Aug. 13, 2019) ⋅ 1616 views |
Merge two Binary search Trees with constant extra space
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rajan published an article Jan. 23, 2020 (Updated Aug. 2, 2019) ⋅ 6649 views |
How to generate OTP (One time password) using python
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rajan published an article Jan. 23, 2020 (Updated July 25, 2019) ⋅ 2868 views |
Get current weather of any city with python using openweathermap API
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rajan published an article Jan. 23, 2020 (Updated July 25, 2019) ⋅ 4237 views |
Getting real time currency exchange rate using Python
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rajan published an article Jan. 23, 2020 (Updated July 23, 2019) ⋅ 1170 views |
Find prime numbers in the first half and second half of an array
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rajan published an article Jan. 23, 2020 (Updated July 18, 2019) ⋅ 2041 views |
Django optimizing Database queries
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rajan published an article Jan. 23, 2020 (Updated July 16, 2019) ⋅ 6365 views |
Check whether two strings contain same characters in same order
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rajan published an article Jan. 23, 2020 (Updated July 16, 2019) ⋅ 6362 views |
Count duplicates in a given linked list
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rajan published an article Jan. 23, 2020 (Updated July 13, 2019) ⋅ 2301 views |
Function Pointers in C++
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rajan published an article Jan. 23, 2020 (Updated July 12, 2019) ⋅ 4774 views |
Remove an element to maximize the GCD of a given array
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rajan published an article Jan. 23, 2020 (Updated July 9, 2019) ⋅ 7987 views |
Find Sum of all Submatrices of a Given Matrix
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rajan published an article Jan. 23, 2020 (Updated June 6, 2019) ⋅ 1255 views |
Length of longest sub-array with maximum arithmetic mean
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rajan published an article Jan. 23, 2020 (Updated May 29, 2019) ⋅ 1473 views |
Learn Full stack development from scratch part - 1 ( step by step guide )
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rajan published an article Jan. 23, 2020 (Updated Jan. 23, 2019) ⋅ 1551 views |
Shuffle elements of an Array most efficient way , Fisher Yates shuffle algorithm
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rajan published an article Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 1155 views |
Top 10 jobs that will have high demand in future
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rajan published an article Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 1133 views |
Top 5 Tv shows Programmers must watch