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from typing import TypeVar, Iterator, AsyncIterator
T = TypeVar("T")
class AnyIterator(Iterator[T], AsyncIterator[T]):
"""
AnyIterator supports iteration through both `for ... in <AnyIterator>` and `async for ... in <AnyIterator> syntaxes.
"""
def __init__(
self, iterator: Iterator[T], async_iterator: AsyncIterator[T]
) -> None:
self._iterator = iterator
self._async_iterator = async_iterator
self._sync_iterated = False
self._async_iterated = False
def __next__(self) -> T:
if self._async_iterated:
raise RuntimeError(
"AnyIterator error: cannot mix sync and async iteration"
)
self._sync_iterated = True
return self._iterator.__next__()
async def __anext__(self) -> T:
if self._sync_iterated:
raise RuntimeError(
"AnyIterator error: cannot mix sync and async iteration"
)
self._async_iterated = True
return await self._async_iterator.__anext__()
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