ScalaPy makes it easy to use Python libraries from Scala code. With a simple API, automatic conversion between Scala and Python types, and optional static typing, ScalaPy scales from hobby projects to production systems.
First, add ScalaPy to your SBT build:
You'll then need to add the Python native libraries to your project and configure SBT to run your code in a separate JVM instance.
If you'd like to use Scala Native, follow the instructions there to create a project with Scala Native
0.4.0-M2. Then, add the following additional configuration to your SBT build to link the Python interpreter.
Now that ScalaPy is installed, let's start with a simple example. ScalaPy offers a dynamically typed API that's great for making quick Python calls with little ceremony. First, we can use the Python
len function to calculate the length of a list. Using
py.Dynamic.global, you can access any members of the global scope.
Here, we took a Scala
List, converted it to a Python list, sent it to the
len function, and got back a Python number.
To convert Python values back into Scala, we use the
.as method and pass in the type we want.