duck.utils.lazy

Lazily evaluates a callable and caches its result with an LRU policy.

Module Contents

Classes

Lazy	Lazily evaluates a callable and caches its result with an LRU policy.
LiveResult	Computes the latest result of a callable.

Data

_dunder_forward
skip_dunders

API

class duck.utils.lazy.Lazy(_callable: Callable, nocache: bool = False, *args, **kwargs)

Lazily evaluates a callable and caches its result with an LRU policy.

Supports automatic delegation of most magic methods, including:

• Standard dunders (len, iter, str, etc.)

• Awaitable (async/await)

• Context manager

• Async generator

Notes:

• You can set nocache=True to compute live results.

Initialization

async __aenter__()

async __aexit__(exc_type, exc_val, exc_tb)

__aiter__()

__all_private_attrs

None

async __anext__()

__await__()

__bool__()

__call__(*args, **kwargs)

__enter__()

__exit__(exc_type, exc_val, exc_tb)

__getattribute__(key)

__setattr__(key, value)

__slots__

(‘_Lazy__callable’, ‘_Lazy__args’, ‘_Lazy__kwargs’, ‘_Lazy__result’, ‘_Lazy__nocache’, ‘_Lazy__extra…

_global_cache: collections.OrderedDict[Tuple[Callable, Tuple, Tuple], Any]

‘OrderedDict(…)’

_max_size: int

256

property extra_data: dict

Returns the dictionary for storing extra data.

getresult() → Any

exception duck.utils.lazy.LazyError

Bases: Exception

Custom exception for Lazy evaluation errors.

Initialization

Initialize self. See help(type(self)) for accurate signature.

class duck.utils.lazy.LiveResult(callable_: Callable, *args, **kwargs)

Bases: duck.utils.lazy.Lazy

Computes the latest result of a callable.

Initialization

duck.utils.lazy._dunder_forward

[‘len’, ‘str’, ‘repr’, ‘bytes’, ‘iter’, ‘reversed’, ‘contains’, ‘__getit…

duck.utils.lazy.skip_dunders

None