tippo 1.0.0

Cleaner and forwards compatible way to use typing features.

Overview

Tippo provides a cleaner and compatible way to use features from both typing and typing_extension with a wide range of python versions.

Example

Instead of using an ugly try block for forwards compatibility…

>>> try:
...     from typing import Generic
... except ImportError:
...     from typing_extensions import Generic
...
>>> try:
...     from typing import final
... except ImportError:
...     from typing_extensions import final
...

…just import directly from tippo!

>>> from tippo import Generic, final

Generic Weak Structures

Tippo also implements generic versions of weak data structures that work with older python versions’ type annotations without the need to defer their evaluation:

>>> from tippo import Any, ReferenceType, WeakSet, WeakKeyDictionary, WeakValueDictionary
>>> class Foo(object):
...     pass
>>> weak_ref = ReferenceType(Foo())  # type: ReferenceType[Foo]
>>> weak_set = WeakSet({Foo()})  # type: WeakSet[Foo]
>>> weak_key_dict = WeakKeyDictionary({Foo(): "foo"})  # type: WeakKeyDictionary[Foo, Any]
>>> weak_value_dict = WeakValueDictionary({"foo": Foo()})  # type: WeakValueDictionary[Any, Foo]