Rajan Kumar

work Founder & Programmer at HackersFriend

location_on India

code Python, HTML, CSS, Django, JavaScript, Competitive programming

public https://www.hackersfriend.com

HackersFriend @rajan ( Joined 2 years, 1 month ago )


Bio: Loves to code.




RK

rajan published an article

March 27, 2020 ⋅ 601 views


Building a news headlines player using Python and text to speech


RK

rajan published an article

March 27, 2020 ⋅ 552 views


Python - Text to Speech by using pyttsx3


RK

rajan published an article

April 20, 2020 ⋅ 682 views


Advanced python concepts the easy way ( Lambda , Map and Filter )


RK

rajan published an article

Aug. 12, 2020 ⋅ 149 views


How to separate Django application config files from code using python decouple


RK

rajan published an article

Sept. 4, 2020 ⋅ 263 views


5 Best Books for Competitive Programming


RK

rajan published an article

April 18, 2020 ⋅ 861 views


Using advanced Python concepts the easy way ( List comprehensions and Slicing )


RK

rajan published an article

April 3, 2020 ⋅ 576 views


How to upload file to SQL server using pyodbc python


RK

rajan published an article

Aug. 11, 2020 ⋅ 133 views


How to return JSON Encoded response from Django View


RK

rajan published an article

April 16, 2020 ⋅ 755 views


How does django prevents clickjacking ?


RK

rajan published an article

Aug. 2, 2020 ⋅ 416 views


7 Data Science project ideas you can work on to stand out


RK

rajan published an article

April 17, 2020 ⋅ 596 views


Building a simple To Do list app using HTML CSS Javascript


RK

rajan published an article

Aug. 10, 2020 ⋅ 691 views


Google off campus drive 2020 for India location


RK

rajan published an article

Aug. 30, 2020 (Updated Aug. 30, 2020) ⋅ 208 views


5 Analytical skills you must acquire as a data scientist


RK

rajan published an article

July 21, 2020 (Updated July 21, 2020) ⋅ 349 views


Handling Exceptions in Python


RK

rajan published an article

May 24, 2020 (Updated May 24, 2020) ⋅ 609 views


Automating backup of PostgreSQL database


RK

rajan published an article

May 16, 2020 (Updated May 16, 2020) ⋅ 646 views


Building Instagram Profile pic downloader in python


RK

rajan published an article

April 28, 2020 (Updated April 28, 2020) ⋅ 716 views


Iteration Protocol and Generators in Python


RK

rajan published an article

April 15, 2020 (Updated April 15, 2020) ⋅ 481 views


Why python is so popular despite being slow ?


RK

rajan published an article

April 4, 2020 (Updated April 6, 2020) ⋅ 325 views


How to redirect using javascript


RK

rajan published an article

March 29, 2020 (Updated March 30, 2020) ⋅ 1109 views


How to prepare for Hack With Infy 2020


RK

rajan published an article

March 22, 2020 (Updated March 24, 2020) ⋅ 752 views


Filtering empty or NULL values in a Django queryset


RK

rajan published an article

Jan. 25, 2020 (Updated March 9, 2020) ⋅ 225 views


forEach() Vs map() in JavaScript - Things every developer should know


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 16, 2020) ⋅ 159 views


Convert a number to a string in C - best way


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 12, 2020) ⋅ 4965 views


Building news aggregator web app with Django using python web scraping


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 231 views


Find Length of a Linked List


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 244 views


Sort string of characters C++


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 8, 2020) ⋅ 190 views


Print a matrix in spiral form


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 6, 2020) ⋅ 161 views


Print reverse of a string using recursion


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 5, 2020) ⋅ 1268 views


Amazon Product Price tracking using Python


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 185 views


Program to find the mid-point of a line


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 3, 2020) ⋅ 227 views


Generate QR Code using python with pyqrcode module


RK

rajan published an article

Jan. 23, 2020 (Updated Dec. 27, 2019) ⋅ 596 views


Mouse and keyboard automation using Python


RK

rajan published an article

Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 150 views


C++ Trigonometric functions


RK

rajan published an article

Jan. 23, 2020 (Updated Dec. 26, 2019) ⋅ 130 views


Remove one element to maximize XOR of array


RK

rajan published an article

Jan. 23, 2020 (Updated Dec. 6, 2019) ⋅ 220 views


Algorithms and Maths you need to know for hard level competitive programming problems


RK

rajan published an article

Jan. 23, 2020 (Updated Dec. 2, 2019) ⋅ 246 views


C++ Hacks for Competitive programming


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 21, 2019) ⋅ 332 views


Add two numbers without using arithmetic operators


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 19, 2019) ⋅ 360 views


Efficient Method to Check if a Number is Multiple of 3


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 18, 2019) ⋅ 387 views


DNA to Protein Converter using Python 3 and Django 2.1


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 16, 2019) ⋅ 330 views


Step by step guide to improve competitive programming skills


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 13, 2019) ⋅ 403 views


Implement a Dictionary using Trie


RK

rajan published an article

Jan. 23, 2020 (Updated Nov. 9, 2019) ⋅ 133 views


Range Trees


RK

rajan published an article

Jan. 23, 2020 (Updated Oct. 19, 2019) ⋅ 2717 views


How to prepare for Google Kickstart – a CodeJam competition?


RK

rajan published an article

Jan. 23, 2020 (Updated Sept. 28, 2019) ⋅ 150 views


HackersFriend Graduated from Y Combinator's Startup School


RK

rajan published an article

Jan. 23, 2020 (Updated Aug. 17, 2019) ⋅ 175 views


Find maximum occurring character in a string


RK

rajan published an article

Jan. 23, 2020 (Updated Aug. 16, 2019) ⋅ 621 views


Sort an array without changing position of negative numbers


RK

rajan published an article

Jan. 23, 2020 (Updated Aug. 14, 2019) ⋅ 230 views


What is Binary Search Tree (BST) ?


RK

rajan published an article

Jan. 23, 2020 (Updated Aug. 13, 2019) ⋅ 238 views


Merge two Binary search Trees with constant extra space


RK

rajan published an article

Jan. 23, 2020 (Updated Aug. 2, 2019) ⋅ 1366 views


How to generate OTP (One time password) using python


RK

rajan published an article

Jan. 23, 2020 (Updated July 25, 2019) ⋅ 416 views


Get current weather of any city with python using openweathermap API


RK

rajan published an article

Jan. 23, 2020 (Updated July 25, 2019) ⋅ 992 views


Getting real time currency exchange rate using Python


RK

rajan published an article

Jan. 23, 2020 (Updated July 23, 2019) ⋅ 176 views


Find prime numbers in the first half and second half of an array


RK

rajan published an article

Jan. 23, 2020 (Updated July 18, 2019) ⋅ 172 views


Django optimizing Database queries


RK

rajan published an article

Jan. 23, 2020 (Updated July 16, 2019) ⋅ 1518 views


Check whether two strings contain same characters in same order


RK

rajan published an article

Jan. 23, 2020 (Updated July 16, 2019) ⋅ 998 views


Count duplicates in a given linked list


RK

rajan published an article

Jan. 23, 2020 (Updated July 13, 2019) ⋅ 232 views


Function Pointers in C++


RK

rajan published an article

Jan. 23, 2020 (Updated July 12, 2019) ⋅ 356 views


Remove an element to maximize the GCD of a given array


RK

rajan published an article

Jan. 23, 2020 (Updated July 9, 2019) ⋅ 997 views


Find Sum of all Submatrices of a Given Matrix


RK

rajan published an article

Jan. 23, 2020 (Updated June 6, 2019) ⋅ 163 views


Length of longest sub-array with maximum arithmetic mean


RK

rajan published an article

Jan. 23, 2020 (Updated May 29, 2019) ⋅ 209 views


Learn Full stack development from scratch part - 1 ( step by step guide )


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 23, 2019) ⋅ 208 views


Shuffle elements of an Array most efficient way , Fisher Yates shuffle algorithm


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 132 views


Top 10 jobs that will have high demand in future


RK

rajan published an article

Jan. 23, 2020 (Updated Jan. 21, 2019) ⋅ 153 views


Top 5 Tv shows Programmers must watch