>>> import zlib
>>> data = zlib.compress(b'abcdefgh' * 200, 9)
>>> corrupt = data[:15] + bytes(60)  # Corrupt the valid stream
>>> d = zlib.decompressobj()
>>> d.decompress(corrupt)  # decompress errors correctly
Traceback (most recent call last):
  File "<python-input-4>", line 1, in <module>
    d.decompress(corrupt)
    ~~~~~~~~~~~~^^^^^^^^^
zlib.error: Error -3 while decompressing data: incorrect data check
>>> d = zlib.decompressobj()
>>> d.decompress(corrupt, 1)  # leaving rest uncomsumed
b'a'
>>> d.flush()  # no flush, corrupted output
b'bcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdefghabcdeP'