Welcome to the world of sine and cosine! These two functions are the backbone of trigonometry, and they’re much simpler than they seem. In this article, we will explore the unit circle, the home of sine and cosine, and learn…
Category: Python
Python code examples
Trigonometric Functions – Sine
The sine function is one of the most fundamental concepts in mathematics, connecting geometry, trigonometry, and real-world applications. In its simplest form, sine is defined in a right triangle as the ratio of the length of the side opposite an…
Rule of 72
Ever heard of the Rule of 72? It’s a classic finance shortcut that tells you how many years it takes for an investment to double at a given interest rate—without reaching for a calculator! Pretty much, if you want to…
Python – Stock Dashboard with Streamlit and YFinance
Imagine that you want to have all the important historical financial information of yahoo finance on your PC. Well, in that case you would probably go there and check it. Anyway, if you are a person, who wants to create…
Automated Stock Diagrams with Python
Automated stock diagrams with Python is actually a rather useful idea, if you want to see how your portfolio is distributed. Just by using 2 columnes – “Ticker” and “Shares” in a CSV file, you can obtain a lot of…
From Pythagoras to Law of Cosines
The field of geometry offers tools that have withstood the test of time, empowering us to understand and solve a variety of triangular problems. Among these, the Pythagorean Theorem and the Law of Cosines are cornerstone concepts. This article provides…
Tagged with: explanation, law of cosines, plotting triangle, pythagorean theorem, Python, Video, youtube
Python – Intersecting Line With Circle
Ever wondered how people can say with 100% security where a circle intersects a line? No? Me too, but still I have decided to try to show how this is done. With Python it looks like a piece of cake.…
Python – Getting an Excel List of all Folders and Files in them
Getting a list of all folders within a given folder is actually a single line command. Writing it to Excel is usually another line. Getting all files, within these folders is not a lot as well. However, having a tool…
Python – Simulating the Bitcoin Mining Process – YouTube video
Ok, currently the BTC is 68 491,28 USD and instead of feeling bad for not buying it, you can try to simulate it the mining process with Python just for fun. It is an interesting way to have fun, but…
Python – Central Limit Theorem
Here is an explanation of the Central Limit Theorem (CLT) in a few simple points: Explanation: The Central Limit Theorem states that the distribution of the sample means (averages) of a large number of samples from any population will be…
Object Oriented Programming with Python – YouTube video
Object oriented programming (OOP) in general is a huge topic, but I have decided to make a 30 minute video, based on the book Math for Programmers, as I liked the way it was explained there: Generally, in the video,…
Tagged with: ABC, classes, inheritance, manning, math, object oriented programming, oop, orland, Python
Linear Algebra – Drawing with Vectors – 3d and 2d
Plotting 2d and 3d vectors into a 3d space can be actually fun. Using mainly the code from Math for Programmers, I am presenting in this video an example of plotting 2d into 3d and back, using identity matrix and…
Simplifying Excel Tasks with Python: Data Handling and Testing Tutorial
Working with Python and Excel is actually quite handy, especially if you are into it. In this article, you can see how to create Excel files, write data and formulas into them and read these. Pretty much simple CRUD methods.…
Tagged with: Coding Tutorial, DataAnalysis, DataScience, ExcelAutomation, Openpyxl, Pandas, Python, UnitTesting
Python API With Flask And Postman – Put and Delete Methods
In the previous article, the post and get API methods were presented. In this one, Put and Delete are coming. 🙂 Well, nothing that fancy, this is how these two methods look like:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 |
# Update item by id @app.route('/api/items/<int:item_id>', methods=['PUT']) def update_item(item_id): data = request.get_json() updated_data = data.get('item') # Get the nested 'item' data if not updated_data: return jsonify({'error': 'No data provided'}), 400 item = next((item for item in items if item['id'] == item_id), None) if item is None: return jsonify({'error': f'Item #{item_id} not found!'}) # Update fields in the item (dummy db) for key, value in updated_data.items(): if key in item: item[key] = value return jsonify({'message': 'Item updated successfully', 'item':item}), 200 # Delete item by id @app.route('/api/items/<int:item_id>', methods=['DELETE']) def delete_item(item_id): item_to_delete = next((item for item in items if item['id'] == item_id), None) if item_to_delete is None: return jsonify({'error': f'Item {item_id} not found!'}), 404 items.remove(item_to_delete) return jsonify({'message': f'Item: {item_to_delete} has been deleted successfully!'}), 200 |
And, of course tests are a…
Python API With Flask And Postman – Post and Get Methods
This is the second video for the “Python API with Flask” series, showing how to make POST and GET commands towards a dummy database, which is a python list in our case. We are using only CREATE and READ commands…
Python – Remove spaces and None from pandas dataframe
In the attached video below, I am simply showing the following 3 pieces of code with Jupyter Notebook: Remove spaces in dataframe columns. Remove none values from dataframe rows. Filter dataframes, based on values. E.g. – put all rows with…
Python OOP – Classes, Methods, Attribures, Composition, Inheritance
Have you ever dreamt about coding classes like a pro? No? You had “normal” dreams? Anyway, in the video below, I am solving 3 exercises with a lot of debugging and some basic tests. Exercises are from the book Python…
Python In Excel – with YouTube video!
Finally! Microsoft did it! Put python in MS Excel! And I was able to install it and test it on my machine! The video of my attempts is here below: The “code” is that one:
|
1 2 3 4 5 6 7 |
def factorial(a): print(a) if (a == 0) or (a == 1): return 1 return a * factorial(a - 1) factorial(5) |
Enjoy it!
Python – Logging into a file and into the console
Python allows decent built-in logging. As I am going to explain in the video below, the built-in logging is actually rather neat – it allows everyone to log into a file or into the console within minutes – just the…
Tagged with: levels of logging, log, logging, logging to a file, logging to console, Python, stream handler
Python – Empty list as a default argument in a python function
This is probably a python “feature” that every junior developer has bumped into – once you make an empty list as a default argument in Python, it works as expected only for the first object of the class. For the second object – not exactly. Don’t worry, everyone has hit that bug, even it they are not willing to admit it.
Python – Reading and Writing Files – With YouTube Video
Another YouTube video for Python – this time, about reading and writing to files. It is a bit interesting, if these are your first steps with Python, for me it was a nice reminder of how the “things” used to…
Python – Cramer’s Rule for Linear Equations – With YouTube Video
Creamer’s rule for a solution of linear equations states pretty much the following: Using this interesting picture from the German Wikipedia, I have created the following video, explaining a bit the Rule of Mr. Cramer: The video goes through the…
Tagged with: cramers rule, Excel, Jupyter, Jupyter Notebook, linear equations, Python, solution of a system
Python – Split worksheet to worksheets, save Excel worksheets to csv
Same article, but for VBA is here – https://www.vitoshacademy.com/vba-split-worksheet-to-worksheets-save-excel-worksheets-to-csv/ This article does 2 things: Splits one worksheet to multiple worksheets Then goes through the worksheets and saves them as *.CSV files So what is the idea? Having this excel file,…
Python – Filtering values from a Pandas DataFrame
Some time ago, probably yesterday or the day before, I had to filter a pandas dataframe and somehow it did not come intuitively into my mind how to do it. As I did not have an article about it, I…
Python – Just a bit about datetime and timedelta
Ok, dates in VBA and Excel are somehow complicated, because of some “feature” that Microsoft Excel has introduced, due to compatibility issues. I have already wrote a few articles about these here, and separate one about what day is Friday…
Python – Init a class with a default list property correctly
Sometimes, (but only sometimes) we think that writing too much code is useless and writing less code in python is more readable and performs faster. While in the general case this is true, this article is simply going to show…
Python – Reading and writing to the console
Reading from the console and writing to it is a piece of cake in python. These two functions do it for you perfectly:
|
1 2 |
a = input() print(a) |
Then why am I writing a whole article about it? Well, there is something fancy, if…
Python – Enumerate Lists in a Loop
Plenty of times, when you are looping with a for-each loop in python, you somehow realize that you need a counter. Then you most probably write something ugly like this one:
|
1 2 3 4 |
a = 0 for count_value in my_odd_squares: a = a + 1 print(f'({a}, {count_value})') |
Why is this ugly? Mainly because the next…
Python – Write a DataFrame or List to multiple tabs in Excel
The idea of the article is to provide a Python code that does the following: Takes a list or DataFrame; Splits it into quite a few smaller parts; Writes each one on a separate Excel worksheet; Pretty much like this:…
Top