Alcides Fonseca

Oskar Wickström shows off recent Python features (generics + pattern matching) that make writing Python more similar to ML, Haskell, Rust or Scala. If you need to support old versions of Python, you will have to wait a couple years before you use proper generics syntax (although you can use the TypeVar class).

def print_tree[T](tree: RoseTree[T]):
    trees = [(tree, 0)]
    while trees:
        match trees.pop(0):
            case Branch(branches), level:
                print(" " * level * 2 + "*")
                trees = [(branch, level + 1) for branch in branches] + trees
            case Leaf(value), level:
                print(" " * level * 2 + "- " + repr(value))

— Statically Typed Functional Programming with Python 3.12