Writing string into a matrix seems like a non-interesting and somehow trivial task. Anyway, manipulating with matrices and strings in Python is actually somehow interesting, thus I have decided to present a small algorithmic challenge. The task is pretty much …
Python – How to write string into a matrix. Printing a matrix. Read more →
Unit testing is the “sweet” part of the programming – once you have tested “all the things”, you feel that the code you have submitted somewhere is actually valid and somehow it works. Furthermore, it allows you to nicely brag …
Statsmodels is a nice statistics library in Python, which eases the data processing and analysis with Python. The library is available here – statsmodels.org and on its official web site the installation guide is always up to date. In the …
Some 4 years ago I wrote an article for calculating magic square with python. What the article did was actually checking whether the square is magic, and not calculating a new one. This one is going to show how these …
Excel – How to build magic square with VBA, following Python Mod Mathematics Read more →
Working with Pandas is like working with Excel on steroids – it can really do a lot of things fast, but somehow doing the easy things get complicated. In this video and article tutorial I am presenting loading data to …
Python – Plotting DataFrame and Working with Pandas – Video Read more →
After writing about hashing passwords in Python, I have decided to publish the other parts of the chapter, “Cryptography” from the “Modern Python Standard Library Cookbook“, written by Alessandro Molina and and kindly provided to me by PacktPublishing.In the article, …
Greedy algorithm is described as an algorithm that follows the problem-solving heuristic of making the locally optimal choice at each stage with the intent of finding a global optimum. Thus, it is always interesting to find a problem, which can …
Python Slice Notation is somehow easy and tough in the same way. Lately, I was doing some competitive programming with Python and I have decided to write a summary of the slice notation, thus there is always a place for …
Codeforces has introduced a third division in their competitions. Initially I though this is the place to go for “easy” stuff, as far as some of the 2nd division problems require some advanced algorithms, like combinations of graphs and months …
Python – Binary String Minimizing Problem – CodeForces Read more →
Scraping data from a web site has always been a pleasure with Python. If you come from the VBA world, the BeautifulSoup4 is indeed beautiful! I have been scraping a web site with python before, but now as I have …
Scraping a web site up to the N-th level with Python Read more →
About 4 years ago, I wrote an article about prime numbers in Excel and their visualisation with VBA – vba-function-in-excel-to-check-prime-numbers. Pretty much, it displays the prime numbers in a 10 x N matrix, starting from 1 and finishing at N: …
Prime numbers matrix and coloring with Python and xlsxwriter Read more →
Scraping a web site with BeautifulSoup 4 and Python is a walk in the park, if you have scraped a web site with VBA before. Still, there are a few tricks, that should be taken into account. Trick #1 – …
Scraping web site and writing its links to a database with Python Read more →
After reading the database to python from the previous post here, it is time to do the ADD data to the database. Our database is created like this: CREATE TABLE “drummers” ( “Id” INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, “Name” …
Connecting SqlLite3 database to a Python file is actually 1 line of code: conn = sqlite3.connect(r”C:\Users\database.db”) I have used a database from sqllitetutorial.net, which was rather neat. Then DB Browser for SQLLite a LEFT JOIN was implemented, in order to …
Connecting SqlLite3 database to Python and Reading it Read more →
Life is hard, when you are learning Python and you see things that are making no sense the way they run. After writing about adding data to SqlLite3 with Python, today I have tried to do the same, but for …
Adding data to SqlLite3 database, but only one value with Python Read more →
Finding all HTML tags from a web page and recording these to a dictionary is magically easy task with Python (if you compare it with #VBA), when Beautiful Soup 4 is used. soup.find_all(True) loops through the tags and a simple …
Find all HTML tags in a web page and print them from a sorted dictionary Read more →
Writing formulas with Excel with Python is a technique, that needs some practice, actually. Although XlsWriter has some good documentaion, not a lot is covered on the point, that concerns creating a file with a formula in it. First and …
Write Formulas in Excel through Python XlsWriter Read more →
Showing all links from a website with Python and BeautifulSoup is actually 6 lines of code – 2 to define the used libraries and 4 to do the job: import urllib.request from bs4 import BeautifulSoup resp = urllib.request.urlopen(“https://www.vitoshacademy.com”) soup = …
Show all links from a website with Python and BeautifulSoup – Video Read more →
The birthday paradox is an interesting problem, mainly because of its somehow “unexpected” results. The problem usually is stated as the following: What is the minimum number of people in a room, in order to have a probability higher than …
After writing the article scraping a web site up to the N-th level with Python, I have decided to summarize what could be achieved with Set() in this language. Pretty much, sets can be described as lists with a few …
Sets in Python – Differece, Symetric Difference, Union, Intersection Read more →
Last week I was participating at the Python and ML Summit in Berlin. One of the most interesting lectures, on which I participated, was a workshop by, named “Reading all yourself was yesterday – How to turn large amounts of …
Numpy and Pandas – Small introduction with Jupyter Notebook Read more →
Python has a built-in GUI package, which allows easy building of forms like this: The package used in this example is tkinter. The form above takes the value, entered in the entry field, squares it and displays it back in …
Editorial (from Vitosh): Lately, I have reviewed the Mastering Large Datasets book by J.T. Wolohan. The book is python based and it explains how to scale a data project, using the map and reduce to scale data projects. Long story …
Learn how to customize PyLab using style in this article by Benjamin Walter Keller, a PhD candidate at McMaster University with BSc in physics with a minor in computer science from the University of Calgary in 2011. This article will delve …
Learn how to plot a correlation matrix using pyplot and object-oriented APIs in this article by Srinivasa Rao Poladi, the co-founder of krtrimaIQ a consulting firm that provides cognitive solutions to create tomorrow’s Intelligent Enterprises powered by automation, big data, …
This article will show you how to solve the CartPole balancing problem. The CartPole is an inverted pendulum, where the pole is balanced against gravity. Traditionally, this problem is solved by control theory, using analytical equations. However, in this article, you’lllearn to solve the …
Python – Balancing CartPole with Machine Learning Read more →
Learn how to build, test, and deploy a Python web service using Zappa in this article by Abdulwahid Abdulhaque Barguzar, a software architect and an active contributor to the open source community. He has developed a deep understanding of architecting …
Learn how to use NumPy for simulations in this tutorial by Alvaro Fuentes, a data scientist with an M.S. in quantitative economics and applied mathematics with more than 10 years of experience in analytical roles. NumPy, also known as Python’s vectorization solution, …
Learn how passwords can be stored without a risk of leaking them in this tutorial by Alessandro Molina, a Python developer since 2001 and currently the core developer of the TurboGears2 web framework and maintainer of Beaker Caching/Session framework.While cryptography is …
Working with VBA is usually not considered high level of programming. Still, when it comes to Excel, this is probably the best solution. However, Python has some libraries which can help a bit, if you are willing to “mimic” the …
Python – Write Values in all Worksheets of existing Excel File Read more →