That chained syntax is entirely doable in Python. I see no reason to object to a1, a2, a3 as intermediate steps in a computation. They don't have a name in you

That chained syntax is entirely doable in Python. I see no reason to object to a1, a2, a3 as intermediate steps in a computation. They don't have a name in your chained style, why does the name matter with the intermediates? This is very clunky, but it is similar, could be streamlined. import aiostream from aiostream.stream import pipe import operator v = aiostream.stream.iterate(set("a ab abc ddd eeee abasdfadf".split())) \ | pipe.filter(lambda x: x.startswith('a')) \ | pipe.map(lambda x: len(x)) \ | pipe.reduce(operator.add, 0) print(await aiostream.stream.list(v))