How to write a Chain Adding Function in Python
The challenge
We want to create a function that will add numbers together when called in succession.
add(1)(2);
# returns 3
We also want to be able to …
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329 articles about python development, tools, and best practices
Get the next biggest number with the same digits using Python
The challenge
Create a function that takes a positive integer and returns the next bigger number that can be formed by rearranging its digits. For …
Read Article →Solving Tribonacci Sequence with Python
The challenge
As the name may already reveal, it works basically like a Fibonacci, but summing the last 3 (instead of 2) numbers of the sequence to …
Read Article →The Casino Chips Problem Solved with Python
The challenge
You are given three piles of casino chips: white, green and black chips:
- the first pile contains only white chips
- the second pile …
Check if Isogram using Python
The challenge
An isogram is a word that has no repeating letters, consecutive or non-consecutive. Implement a function that determines whether a …
Read Article →Find the Longest Common Prefix using Python
The challenge
Write a function to find the longest common prefix string amongst an array of strings. This string manipulation challenge requires …
Read Article →Count and Say with Python
The challenge
he count-and-say sequence is the sequence of integers with the first five terms as following:
1. 1 2. 11 3. 21 4. 1211 …Read Article →
The Plus One problem solved with Python
The challenge
Given a non-empty array of digits representing a non-negative integer, increment one to the integer. This challenge involves array …
Read Article →Solving the Single Number problem in Python
The challenge
Given a non-empty array of integers, every element appears twice except for one. Find that single one.
Note:
Your algorithm should have …
Read Article →Rotate a Matrix List in Python
The challenge
You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Note:
You have to rotate the image …
Read Article →Find the Intersection of Two Arrays in Python
The challenge
Given two arrays, write a function to compute their intersection.
Example 1:
Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] …Read Article →
Rotate an Array K Times in Python
The challenge
Given an array, rotate the array to the right by k steps, where k is non-negative.
Example 1:
Input: nums = [1,2,3,4,5,6,7], k = 3 …Read Article →
Python Splices reimplemented in Java
Python has a fantastic feature called slices. It allows you to work with a list, set or string by it’s index items.
E.g.:
string_sample = …Solving Two Sum in Python
The challenge
Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input …
Read Article →Get the Next Small Integer in Python
The challenge
Write a function:
def solution(A)
that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does …
Read Article →Find All Numbers Disappeared in an Array using Python
The challenge
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once.
Find all the …
Read Article →HashMaps (aka: Dictionaries) in Python
Introduction
Java has a built-in called HashMap. It allows you to store and very quickly retrieve key value pairs.
In Python, this is called a …
Read Article →Get The Shortest Path in Binary Matrix using Python
The challenge
In an N by N square grid, each cell is either empty (0) or blocked (1).
A clear path from top-left to bottom-right has length k if and …
Palindrome Partitioning in Python
The problem
Given a string s, partition s such that every substring of the partition is a palindrome.
Return all possible palindrome partitioning of s …
Read Article →Best Time to Buy and Sell Stock with Python
The problem
Say you have an array prices for which the ith element is the price of a given stock on day i.
Design an algorithm to find the maximum …
Read Article →Self Dividing Numbers using Python
Introduction
A self-dividing number is a number that is divisible by every digit it contains.
For example, 128 is a self-dividing number because 128 % …
RuntimeError: thread.__init__() not called (Python)
Today I got a really dumb error from Python.
RuntimeError: thread.init() not called
But luckily it’s really easy to fix!
Below is the code …
Read Article →How to get the UTC Timestamp in Python
All dates in your server applications should be stored in the UTC timezone.
This is because you always want to store time without the offset of the …
Read Article →How to make an HTTP Request in AWS Lambda using Python
The requests module for Python is very useful in helping simplify HTTP/s requests from Python, but how would you use it in an AWS Lambda script? …