对列表的重复元素进行分组

from collections import defaultdict

def group_duplicates(lst):
    grouped = defaultdict(list)
    for item in lst:
        grouped[item].append(item)
    return dict(grouped)

# 示例列表
example_list = [1, 2, 2, 3, 4, 4, 4, 5]

# 分组结果
grouped_result = group_duplicates(example_list)
print(grouped_result)

{1: [1], 2: [2, 2], 3: [3], 4: [4, 4, 4], 5: [5]}

for key, value in grouped_result.items():
    print(f"元素 {key} 出现了 {len(value)} 次")

unique_elements = [key for key, value in grouped_result.items() for _ in range(1)]
print(unique_elements)