Martin Panter <vadmium...@gmail.com> added the comment:

According to the documentation, you can use the lower-level GzipFile 
constructor’s “filename” argument:

>>> with open(output_path, 'wb') as f_out, \
...     gzip.GzipFile(fileobj=f_out, mode='wb', filename=input_path) as f_out, \
...     open(input_path, 'rb') as f_in:
...         shutil.copyfileobj(f_in, f_out)
... 
>>> import os
>>> os.system("7z l test.txt.gzip")
[. . .]
   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
2018-01-28 22:23:16 .....           30           34  test.txt
------------------- ----- ------------ ------------  ------------------------

----------
nosy: +martin.panter

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32698>
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