Split a sequence into chunks closest to the given ratio

split.py

from typing import Sequence
import numpy as np


def split_list(items: Sequence, ratios: Sequence[float]):
    ratios = np.cumsum(np.array(ratios) / sum(ratios)).tolist()
    indices = [0] + [int(round(len(items) * r)) for r in ratios]
    return [items[i:j] for i, j in zip(indices, indices[1:])]