按年-月对文件大小求和，并在打印时包含按年汇总

import os
from collections import defaultdict

# 文件目录
directory = '/path/to/files'

# 按年-月求和的结果
sum_by_year_month = defaultdict(int)

# 按年汇总的结果
sum_by_year = defaultdict(int)

# 遍历文件列表
for filename in os.listdir(directory):
    filepath = os.path.join(directory, filename)
    
    # 解析文件名和大小
    file_size = os.path.getsize(filepath)
    year, month = filename[:4], filename[5:7]
    
    # 按年-月进行求和
    sum_by_year_month[(year, month)] += file_size
    
    # 按年进行汇总
    sum_by_year[year] += file_size

# 打印结果
for (year, month), size in sum_by_year_month.items():
    print(f"{year}-{month}: {size} bytes")
    
for year, size in sum_by_year.items():
    print(f"{year} total: {size} bytes")