import zlib

import os

ss = 's' * 1024 * 1024

#写入原始文件

file = open("src.dat", "wb")

file.write(ss.encode())

file.close()

#读取上一步原始的文件

file = open("src.dat", "rb")

sss = file.read(os.path.getsize("src.dat"))     #获取文件大小

file.close()

#压缩文件

compress = zlib.compress(sss)

#写入压缩文件

file = open("compress.dat", "wb")

file.write(compress)

file.close()

#读取上一步的压缩文件

file = open("compress.dat", 'rb')

sss = file.read(os.path.getsize("compress.dat"))

file.close()

decompress = zlib.decompress(sss)

#写入还原文件

file = open("decompress.dat", "wb")

file.write(decompress)

file.close()

print(len(ss))

print(len(compress))

print(len(decompress))