Constrained

:caution: Not working; not maintained. Use annotated-types instead. :caution:

A Python library for enforcing type and range constraints.

Features

• Float and Int types with range constraints
• Regex type for string matching
• CFG type for context-free grammar matching
• enforce_annotation_constraints decorator to enforce constraints

Installation

pip install constrained

Usage

First, import the necessary types and the decorator from the constrained module:

from constrained import Float, Int, Regex, CFG, enforce_annotation_constraints

Then, define your function with type annotations:

@enforce_annotation_constraints
def P(x: Float[0, 'inf']) -> Float[0, 'inf']:
    return x / 2

The decorator will enforce the constraints at runtime and raise a ValueError if any argument or the return value does not match the constraints defined in the function's signature.

Alternatives

• annotated-types (much better than constrained and up-to-date (08/2023); pip install annotated-types)
• Constrained Types