[issue43613] gzip.compress and gzip.decompress are sub-optimally implemented.

[Ruben Vorderman]

Ruben Vorderman <r.h.p.vorderman at lumc.nl> added the comment:

Issue was solved by moving code from _GzipReader to separate functions and maintaining the same error structure. 
This solved the problem with maximum code reuse and full backwards compatibility.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43613>
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