创建随机比率，每组加起来为1

import random

def create_random_ratios(num_groups, num_elements):
    ratios = []
    total_sum = 0

    # 生成随机数
    for _ in range(num_groups):
        ratio = random.random()
        ratios.append(ratio)
        total_sum += ratio

    # 归一化处理
    for i in range(num_groups):
        ratios[i] /= total_sum

    # 分组
    groups = []
    start = 0
    for i in range(num_groups):
        end = start + num_elements
        groups.append(ratios[start:end])
        start = end

    return groups

# 示例调用
groups = create_random_ratios(3, 4)
for group in groups:
    print(group)