typing-validation 0.0.1.post4

A simple library for runtime type-checking.

Python Typing Validation

Table of Contents

• Install
• Usage
• API
• Contributing
• License

Install

You can install the latest release from PyPI as follows:

pip install 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'

For union types, detailed validation failures are shown for individual union member types, where available:

>>> from typing import *
>>> validate([[0, 1, 2], {"hi": 0}], list[Union[Collection[int], dict[str, str]]])
TypeError: For type list[typing.Union[typing.Collection[int], dict[str, str]]],
invalid value: [[0, 1, 2], {'hi': 0}]
  For type typing.Union[typing.Collection[int], dict[str, str]], invalid value: {'hi': 0}
    Detailed failures for member type typing.Collection[int]:
      For type <class 'int'>, invalid value: 'hi'
    Detailed failures for member type dict[str, str]:
      For type <class 'str'>, invalid value: 0

API

The API documentation for this package is automatically generated by pdoc. Detailed examples can be found in the notebooks folder folder.

Contributing

Please see the contributing file.

License

MIT © Hashberg Ltd.