After Learning Kotlin – Part 1 and Learning Kotlin – Part 2 we will now dive into the ranges. One nice little feature is the .. syntax: you can generate an IntRange object just by specifying the start and the end element: val oneTo10 = 1..10 You can even use values for the start and…
Features and Permissions A permission is something an app is allowed to do 🙂 E.g. using the camera, reading location or accessing your contacts. <uses-permission android:name=”android.permission.CAMERA” /> <uses-feature android:name=”android.hardware.camera” android:required=”true” /> Internet Access If your app uses e.g. web-APIs you need internet access. This can be achieved by adding android.permission.INTERNET to your manifest. In this…
In Learning Kotlin – Part 1 we looked at some basic concepts like type inference and string handling. In this part we deal with arrays: You can easily create an array with the arrayOf function var myArray = arrayOf(1, 1.23, “Jörn”) Element access You can access arrays directly with the [] operator println(myArray[2]) myArray[1] =…
Motivation I wanted to try writing an Android app. In spite of using plain old Java I wanted to give the new kid on the block Kotlin (from the Jetbrains folks) a try. First observations Coming from a Python background it’s good to see that Kotlin doesn’t use semi-colons! But the curly braces from Java…
In my article Python Type Checking I wrote about type hints. Type hints are around the block since Python 3.5. Python 3.7 introduced another interesting concept to make Python code even more type safe: Protocols Duck typing If it walks like a duck and it quacks like a duck, then it must be a duck…
The Rules 10h before sleep – no caffeine 3h before sleep – no more eating 2h before sleep – no more work 1h before sleep – no more tv / tablet 0 times snoozing the alarm clock in the morning So when I want to get to bed at around 22:00 (10pm) my schedule would…
As the Junior Data Scientist of Knight Industries we created a table to keep track of all our operatives: SQL-Basics: Create, Read, Update, Delete Devon asks us to keep track of our operations aka missions as well. For the first implementation let us assume that a mission has one operative and an operative can participate…
In SQL-Basics we learned the standard SQL statements to create a table, insert data into it, retrieving data from tables and altering data. Now we want to do even Devon is a data driven man and to evaluate our mission, he likes to know from us: how many missions we finished the total cost of…
import unicodecsv def read_csv(filename): with open(filename, ‘rb’) as f: reader = unicodecsv.DictReader(f) return list(reader)
In Distributing your own package on PyPi I wrote about my first package on PyPI. Here are some refinements aka lessons learned: Project Description on PyPI I wondered why the project description on PyPi was empty. Solution: You need a long_description. If You already have a README.md, you can read it into a string and…