Source code for paco.filterfalse

# -*- coding: utf-8 -*-
import asyncio
from .filter import filter
from .decorator import overload

def assert_false(element):
    Asserts that a given coroutine yields a non-true value.
    return not element

[docs]@overload @asyncio.coroutine def filterfalse(coro, iterable, limit=0, loop=None): """ Returns a list of all the values in coll which pass an asynchronous truth test coroutine. Operations are executed concurrently by default, but results will be in order. You can configure the concurrency via `limit` param. This function is the asynchronous equivalent port Python built-in `filterfalse()` function. This function is a coroutine. This function can be composed in a pipeline chain with ``|`` operator. Arguments: coro (coroutine function): coroutine filter function to call accepting iterable values. iterable (iterable): an iterable collection yielding coroutines functions. assert_fn (coroutinefunction): optional assertion function. limit (int): max filtering concurrency limit. Use ``0`` for no limit. loop (asyncio.BaseEventLoop): optional event loop to use. Raises: TypeError: if coro argument is not a coroutine function. Returns: filtered values (list): ordered list containing values that do not passed the filter. Usage:: async def iseven(num): return num % 2 == 0 await paco.filterfalse(coro, [1, 2, 3, 4, 5]) # => [1, 3, 5] """ return (yield from filter(coro, iterable, assert_fn=assert_false, limit=limit, loop=loop))