iter_proto.py

from collections.abc import Iterable, Iterator
from types import GeneratorType


class OnlyIter:
    def __iter__(self):
        return self


class OnlyNext:
    def __init__(self):
        self._n = 0

    def __next__(self):
        if self._n < 10:
            return 1
        else:
            raise StopIteration()


class IterNext(OnlyIter, OnlyNext):
    pass


def gen():
    yield 1


print(f"""
{isinstance((_ for _ in range(10)), GeneratorType)=}
{isinstance(range(10), GeneratorType)=}
{isinstance(gen(), GeneratorType)=}
{isinstance(gen(), Iterable)=}
{isinstance(gen(), Iterator)=}
{isinstance(iter(gen()), Iterable)=}
{isinstance(iter(gen()), Iterator)=}
{isinstance(range(10), Iterable)=}
{isinstance(range(10), Iterator)=}
{isinstance(iter(range(10)), Iterable)=}
{isinstance(iter(range(10)), Iterator)=}
{isinstance(OnlyNext(), Iterable)=}
{isinstance(OnlyNext(), Iterator)=}
{isinstance(OnlyIter(), Iterable)=}
{isinstance(OnlyIter(), Iterator)=}
{isinstance(IterNext(), Iterable)=}
{isinstance(IterNext(), Iterator)=}
""")

isinstance((_ for _ in range(10)), GeneratorType)=True
isinstance(range(10), GeneratorType)=False
isinstance(gen(), GeneratorType)=True
isinstance(gen(), Iterable)=True
isinstance(gen(), Iterator)=True
isinstance(iter(gen()), Iterable)=True
isinstance(iter(gen()), Iterator)=True
isinstance(range(10), Iterable)=True
isinstance(range(10), Iterator)=False
isinstance(iter(range(10)), Iterable)=True
isinstance(iter(range(10)), Iterator)=True
isinstance(OnlyNext(), Iterable)=False
isinstance(OnlyNext(), Iterator)=False
isinstance(OnlyIter(), Iterable)=True
isinstance(OnlyIter(), Iterator)=False
isinstance(IterNext(), Iterable)=True
isinstance(IterNext(), Iterator)=True