diff options
Diffstat (limited to 'synapse/util')
| -rw-r--r-- | synapse/util/iterutils.py | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/synapse/util/iterutils.py b/synapse/util/iterutils.py index c10016fbc5..06faeebe7f 100644 --- a/synapse/util/iterutils.py +++ b/synapse/util/iterutils.py @@ -33,3 +33,16 @@ def batch_iter(iterable: Iterable[T], size: int) -> Iterator[Tuple[T]]: sourceiter = iter(iterable) # call islice until it returns an empty tuple return iter(lambda: tuple(islice(sourceiter, size)), ()) + + +ISeq = TypeVar("ISeq", bound=Sequence, covariant=True) + + +def chunk_seq(iseq: ISeq, maxlen: int) -> Iterable[ISeq]: + """Split the given sequence into chunks of the given size + + The last chunk may be shorter than the given size. + + If the input is empty, no chunks are returned. + """ + return (iseq[i : i + maxlen] for i in range(0, len(iseq), maxlen)) |