Python zlib模块 出错问题

import zlib

s = 'asdasdfahjklfsjkldfhoidsfsfswhqefrsndfsn lfnsfg hfoshaifgsdluikfga'
zlib_s = zlib.compress(s)
print(zlib_s)

TypeError: a bytes-like object is required, not 'str'

不知道哪里出错了， 在线急....