Python code examples
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,…
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…
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…
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…
Reading from the console and writing to it is a piece of cake in python. These two functions do it for you perfectly:
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a = input() print(a) |
Then why am I writing a whole article about it? Well, there is something fancy, if…
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:
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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…
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:…
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…
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,…
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…
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…
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:
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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…
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.…
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…
If you have ever dreamed that it will be possible to fill out an Excel cell with a picture, using Python, then you should probably reevaluate your dreams. Seriously, who dreams of something like that? Without further dreaming, the code…
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…
Ok, so you probably have heard about set in Python – it is a collection with non-repeatable elements – as if you are a stamp collector and you need to collect only the unique stamps into your album. However, in…
Functions in Python are objects. If this is the first time you read this sentence, then you will not get a lot from this article, but it will show you, that there is quite a lot to learn about Python.…
Have you seen the error below?
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Traceback (most recent call last): File "C:/Users/foo/PycharmProjects/pythonProject3/main.py", line 29, in <module> main() File "C:/Users/foo/PycharmProjects/pythonProject3/main.py", line 19, in main a['foo'] += 5 KeyError: 'foo' |
Of course you have. And you know, that it is because you have written something extremely unwise like this:
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a = dict() a['foo'] += 5 |
Yeah. You cannot increment the value of a non-existent key. Unless… Unless you…
Intersection of dictionary (or of any two lists) is a list with elements, that are present in both other lists. Thus, if we have the following 3 dictionaries in Python:
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dict_a = dict([('aa', 4139), ('bb', 4127), ('cc', 4098)]) dict_b = dict(aa=4139, bb=4127, ee=4098) dict_c = {'aa':12, 'bb':13, 'dd':23} |
Then, an intersection of their keys will contain only…
Class variables vs instance variables could seem a bit strange, if you have no OOP experience, but after a few thausand lines of code they become logical. So, in around two days of programming you will be getting it intuitively…
__repr__ and __str__ dunders are quite similar in Python. If you need a quick summary of these 2, then these 3 points will be enough: __repr__ dunder presents the class object, whenever it is called by the terminal __str__ dunder…
The difference between json.dump and json.dumps is actually quite visible: dump() – dumps into a file or StringIO dumps() – dumps a string, that could be printed Still, I am going to give a few example with these, as the…
One of the benefits of having your own blog and not following any schedule for subjects to write about is that you may write for whatever you feel like, whenever you feel like. So, Iterations in Python is the subject…
Making a CRUD application with Python is actually one of the basic thing a Python Developer should be able to do. Although some may argue it is extremely basic – it is not. Requirements The basic requirements for this one,…
The idea of the article is to show how to make a simple Django App, with 4 links, each of which navigates to a specific page. The whole code of the “app” is in GitHub, here: https://github.com/Vitosh/Python_personal/tree/master/JustProject. In general, these are…
Exception handling in python is actually quite an interesting topic. In general, the exceptions in programming could be of three types: syntactic errors – these would be noticed by your IDE or by the interpretor, thus you do not need…
Using API calls with VBA and Python to write a database is actually a pretty decent architecture. Here, I would like to say that “It takes the best of the both worlds”, but the truth is that it takes the…
This is a short step-by-step introduction on how to build virtual environment in Python and how to use it. Virtual envirnments keep dependencies, required by the specific project separated. Thus, it is the “clean and clear” place of the project,…
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…