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gh-91349: Adjust default compression level to 6 (down from 9) in gzip and tarfile #131470

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gpshead merged 8 commits into from
Jul 20, 2025
+31 −10
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gh-91349: Adjust default compression level to 6 (down from 9) in gzip and tarfile #131470

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gh-91349: Adjust default compression level to 6 (down from 9) in gzip…
rmmancom Mar 19, 2025
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rmmancom Jun 25, 2025
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rmmancom Jun 25, 2025
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Update Doc/library/gzip.rst
morotti Jul 18, 2025
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Update Doc/library/gzip.rst
morotti Jul 18, 2025
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morotti Jul 18, 2025
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Update Doc/library/tarfile.rst
morotti Jul 18, 2025
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Update Misc/NEWS.d/next/Library/2025-03-19-12-41-42.gh-issue-91349.8e…
morotti Jul 20, 2025
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@rmmancom
rmmancom committed Jun 25, 2025
commit 7ba376e74beabb05a15d8236dd8af15ee23da815
14 changes: 14 additions & 0 deletions Doc/library/gzip.rst
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Expand Up @@ -59,6 +59,11 @@ The module defines the following items:
.. versionchanged:: 3.6
Accepts a :term:`path-like object`.

.. versionchanged:: 3.14
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The default compression level was reduced to 6 (down from 9).
It is the default level used by most compression tools and a better
tradeoff between speed and performance.

.. exception:: BadGzipFile

An exception raised for invalid gzip files. It inherits from :exc:`OSError`.
Expand Down Expand Up @@ -181,6 +186,11 @@ The module defines the following items:
Remove the ``filename`` attribute, use the :attr:`~GzipFile.name`
attribute instead.

.. versionchanged:: 3.14
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The default compression level was reduced to 6 (down from 9).
It is the default level used by most compression tools and a better
tradeoff between speed and performance.


.. function:: compress(data, compresslevel=6, *, mtime=0)

Expand All @@ -206,6 +216,10 @@ The module defines the following items:
The *mtime* parameter now defaults to 0 for reproducible output.
For the previous behaviour of using the current time,
pass ``None`` to *mtime*.
.. versionchanged:: 3.14
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The default compression level was reduced to 6 (down from 9).
It is the default level used by most compression tools and a better
tradeoff between speed and performance.

.. function:: decompress(data)

Expand Down