hashberg-io / typing-validation

A simple library for runtime type-checking.

typing-validation: Validation using Type Hints

Typing-validation is a small library to perform runtime validation of Python objects using PEP 484 type hints.

Contents

• Install
• Usage
• API
• Contributing
• License

Install

You can install the latest release from PyPI as follows:

pip install --upgrade typing-validation

Usage

The core functionality of this library is provided by the validate function:

>>> from typing_validation import validate

The validate function is invoked with a value and a type as its arguments and it returns nothing when the given value is valid for the given type:

>>> validate(12, int)
# nothing is returned => 12 is a valid int

If the value is invalid for the given type, the validate function raises a TypeError:

>>> validate(12, str)
TypeError: For type <class 'str'>, invalid value: 12

For nested types (e.g. parametric collection/mapping types), the full chain of validation failures is shown by the type error:

>>> validate([0, 1, "hi"], list[int])
TypeError: For type list[int], invalid value: [0, 1, 'hi']
  For type <class 'int'>, invalid value: 'hi'

API

For the full API documentation, see https://typing-validation.readthedocs.io/

Contributing

Please see CONTRIBUTING.md.

License

MIT © Hashberg Ltd.