Berker Peksag <berker.pek...@gmail.com> added the comment:

The OP's report is valid and they already stated that the file is malformed. 
More importantly, this can be reproduced with a valid ZIP file as well.

The correct behavior is to get RuntimeError in this case.

_check_compression() needs to be called before _get_decompressor().

There is no issue when getting the compressor object because 
_check_compression() is called inside _writecheck().

----------
components: +Library (Lib)
nosy: +berker.peksag, serhiy.storchaka
resolution: not a bug -> 
stage: resolved -> patch review
status: closed -> open

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36991>
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