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"""Utility function.""" |
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from typing import ( |
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Any, |
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AsyncGenerator, |
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AsyncIterable, |
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Awaitable, |
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Callable, |
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Iterable, |
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TypeVar, |
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Union, |
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) |
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__all__ = ['amap', 'afilter', 'run'] |
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T = TypeVar('T') |
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async def amap( |
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corofunc: Callable[[Any], Awaitable[T]], iterable: Union[AsyncIterable, Iterable] |
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) -> AsyncGenerator[T, None]: |
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"""Map an async function onto an iterable or an async iterable. |
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# Parameters |
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corofunc (Callable[[Any], Awaitable[T]]): coroutine function |
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iterable (Union[AsyncIterable, Iterable]): iterable or async iterable collection |
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which will be applied. |
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# Returns |
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AsyncGenerator[T]: an async iterator of corofunc(item) |
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# Example |
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```[i async for i in amap(inc, afilter(even, [0, 1, 2, 3, 4]))]``` |
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""" |
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if isinstance(iterable, AsyncIterable): # if hasattr(iterable, '__aiter__'): |
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async for item in iterable: |
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yield await corofunc(item) |
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else: |
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for item in iterable: |
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yield await corofunc(item) |
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async def afilter( |
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corofunc: Callable[[Any], Awaitable[bool]], iterable: Union[AsyncIterable, Iterable] |
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) -> AsyncGenerator[T, None]: |
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"""Filter an iterable or an async iterable with an async function. |
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# Parameters |
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corofunc (Callable[[Any], Awaitable[bool]]): filter async function |
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iterable (Union[AsyncIterable, Iterable]): iterable or async iterable collection |
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which will be applied. |
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# Returns |
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(AsyncGenerator[T]): an async iterator of item which satisfy corofunc(item) == True |
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# Example |
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```[i async for i in amap(inc, afilter(even, [0, 1, 2, 3, 4]))]``` |
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""" |
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if isinstance(iterable, AsyncIterable): # if hasattr(iterable, '__aiter__'): |
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async for item in iterable: |
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if await corofunc(item): |
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yield item |
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else: |
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for item in iterable: |
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if await corofunc(item): |
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yield item |
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# pylint: disable=unused-import |
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try: |
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import curio # noqa: F401 |
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from contextvars import copy_context |
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def run(kernel, target, *args): |
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"""Curio run with independent contextvars.""" |
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return copy_context().run(kernel.run, target, *args) |
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except Exception: # pylint: disable=broad-except |
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def run(kernel, target, *args): |
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raise RuntimeError('curio not installed!') |
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geronimo-iia /
async-btree
