typedclasses

Python classes with types validation at runtime.

This is purely an experiment, not meant for actual use.

Installation

You can install this library using Python's favorite, pip package manager.

pip install -U typedclasses

How it works

Using typedclasses, you can create classes in dataclasses-like manner i.e using type annotations and library will enforce types for that class at runtime. Here's an example:

import typing
from typedclasses import TypedClass

class User(TypedClass):
  id: int
  name: str
  email: typing.Optional[str] = None

Parameters will be validated when initialising above class. Since email has a default value set, It is optional to pass it as a parameter while instansiating:

>>> User(id=1, name="foobar") # runs fine
>>> User(id="1", name="foobar")
TypeError: Parameter 'id' must be an instance of <class 'int'>, <class 'str'> is unsupported.

This library also provides validation for various generic types from typing module:

class Foo(TypedClass):
  x: typing.Union[int, float]

Foo(x=1) # ok
Foo(x=1.0) # ok
Foo(x="1") # invalid

List of all types supported from typing module can be found in the documentation.

Contribute

You can contribute to the library in two ways:

• Directly contributing to code using pull requests.
• Suggest features or report bugs via issues.

We welcome all contributions! 👍

When using issues, Please be descriptive about your issue and for pull requests, Try to be consistent with current design.