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…
Tag: Python
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
Dot Product in 2D with Python
Talking about dot products in linear algebra can be really a subject of hours, but long story short this is probably the minimal knowledge you can live with: The dot product (inner product) is an operation on 2 vectors that…
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 – Make a simple API with Flask and Postman
Flask is actually really a powerful tool for making an API. In the video below, you would see how quickly I am building an API, that does four really simple functions. The functions are – saying “Hello”, multiplying a number by…
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 – 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 – Lambda Expressions – With YouTube Video
As one of the acknoledged reviewers of the Manning book Python How-To, I have decided to make a YouTube video, based on a part of the book, mentioning Lambda Expressions. The video is here, and the code I have used…
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
Azure – Quickstart: Deploy a Pyton Flask web app to Azure App Service – With YouTube Video
Following the step-by-step original tutorial here, I have created a simple Azure video tutorial, explaining how to deploy a python flask web app with local git. The idea to have something on your own PC and then simply using this…
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 – 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 – Plotting a circle with matplotlib
Plotting a circle with matplotlib library in python is an interesting task. If you google it, you will find quite good answers, but anyway, I am here because I want to summarize my point of view. Pretty much, the idea…
Python – dictionary to CSV
Dictionary to a CSV file is probably a good question, if you are hiring a VBA developer. For a python person it should be a trivial one, as this one should not be even a tough search in Google. Anyway,…
How to get redirect url using Excel VBA or Python
Getting some tiny URL, that redirects you to somewhere else might be dangerous. There are a lot of people, that would never ever click on bit.ly/something or goo.gl/something, just because they do not know where the redirect is going to…
Python – Find All Substrings Between Two Character Pairs with RegEx
Sometimes you need to do what you need to do – use Regular Expressions for a trivial task. Now, imagine that you have some big text and you need to extract all substrings from the text between two specific words…
Python – Parsing PDFs with Tika
Reading from a pdf is actually quite an easy task with Python. If the PDF is of course “readable”, e.g. made from a word processor. The first thing to do is to install Tika and Java:
|
1 2 3 |
pip install tika <em>conda install</em> -c conda-forge <em>tika # as alternative</em> java --version #this one checks the installed java version in the command prompt |
Having this, the…
Python – Ordered Dictionary and Heap Queue
After writing about Default Dictionary in Python some time ago, now it is time to take a look at the ordered dictionary and the heap queue as these are built-in structures, coming out of the box. And they are fancy.…
Python – Read and Write to Excel ActiveX Textbox
Reading and writing to an Excel ActiveX textbox with Python can be fun. If you really do not have anything better to do. Anyway, if this is your current task, you are on the correct place to see how it…
Python – Logging in Python. Formatting with Black
Logging in Python is beautifully implemented with the logging library – https://docs.python.org/3/howto/logging.html It simply does anything you need and you do not need to write something yourself, like I did some time ago here in my VBA Boilerplate. So, if…
Top
Python – Docstring – Help and Comments
Docstrings in Python are actually quite simple – the are 3 times this """ and the code between opening and closing them can be formatted in any possible way. The reason I have decided to dedicate a whole article to…