py-lenses

Experimental lens like library in Python

Goals:

• reusability and composition of lenses
• typesafe
• easy syntax

Example of a composed lens using the overloaded >> operator

    data = {"x": {"y": 42}}

    lens_x = DictLens[dict](key="x")
    lens_y = DictLens[int](key="y")

    error, result = data >> lens_x >> lens_y

    assert result == 42