Motivation Sometimes you need to find files across multiple directories and / or directory hierarchies according to certain pattern. E.g. find all image files with the jpg extension You can use it to find files in a directory by using wildcard semantics. Let’s say we have a directory structure like this: glob_test/ |– dir_a/ |–…
The Tools Prusa included some tools. Pliers, a screwdriver and some hex wrenches. Their claim is that this is all you need to assemble the printer. While that might be true you should consider some additional tools. An electric screwdriver with the correct bits speeds up the process. And a hex socket should be used…
As mentioned in my New Year’s Resolutions and Technology Learning Roadmap 2022 I wanted to learn about 3D printing. After a serval hours of contemplating and researching I finally bought a Prusa i3 MK3S+ 3D Printer. I’ve decided to buy a kit instead of a fully assembled version to save a few bucks and to…
Motivation Understanding Gradle is mandatory if you want to build good Android apps Bare Minimum This is the bare minimum you need to be able to compile and run an Android application: plugins { id ‘com.android.application’ id ‘kotlin-android’ } android { compileSdk 30 defaultConfig { applicationId “de.creatronix.myapplication” minSdk 21 } } dependencies { implementation ‘androidx.core:core-ktx:1.6.0’…
What should you put into your __init__.py? Perhaps you already know that a python package is a directory which contains a __init__.py file In this article we will solve the mystery around the __init__.py For this article let’s assume the following project structure: Empty init file Sometimes doing nothing isn’t so bad at all. You…
Motivation Python decorators are a nice way to implement the decorator pattern. Perhaps you read the article about Python data classes and wondered how the @dataclass thingy worked. Example Let’s say we created the following function: def un_decorated_function(): print(‘–> Starting un_decorated_function’) print(‘Inside un_decorated_function’) print(‘<– un_decorated_function finished’) This works but violates the DRY principle if repeated…
This is not a “my way or the highway” kind of advice. Just a bunch of good practices. A starting point if you are new to Python. You will likely inspect and adapt your own project structure over time. The bare minimum This is a setup I recommend when just want to start with a…
Motivation I’ve written about Software Testing Concepts in general and also about pytest in particular. Now I want to introduce you to a nice little add-on which makes your testing -hopefully- easier. Hamcrest Hamcrest is around for a couple of years. I’ve used it together with JUnit back in the days. It had a bit…
Why should you use a Jenkinsfile? The biggest advantage of a Jenkinsfile is the ability to use version control to manage your build system. When you use freestyle jobs you can loose you configuration due to limit history depth. Descriptive vs Scripted Jenkinsfiles come in two flavours: Declarative pipelines always begin with the word pipeline…
Sometimes you want to delete a folder in Python. You know that os.rmdir() can do that for you. But then you realize it can only remove empty folders. If you want to remove the content before deleting the folder you come up with: def remove_non_empty_dir(path_to_dir): if os.path.exists(path_to_dir): files_in_dir = os.listdir(path_to_dir) for file in files_in_dir: os.remove(os.path.join(path_to_dir,…