DEPR: NDFrame.set_axis inplace defaults to false

[ghost]

pandas/pandas/core/generic.py

Lines 594 to 598 in 76247c1

	.. warning::
	``inplace=None`` currently falls back to to True, but in a
	future version, will default to False. Use inplace=True
	explicitly rather than relying on the default.

has been there since #20164, part of 0.21.0

With discussion of plans to deprecate similar functionality from set_index in #24046, it's time to make sure set_axis conforms to the rest of pandas in this.

[codecov]

Codecov Report

Merging #27525 into master will decrease coverage by 50.56%.
The diff coverage is 50%.

@@             Coverage Diff             @@
##           master   #27525       +/-   ##
===========================================
- Coverage   92.96%    42.4%   -50.57%     
===========================================
  Files         184      184               
  Lines       50339    50338        -1     
===========================================
- Hits        46799    21346    -25453     
- Misses       3540    28992    +25452

Flag	Coverage Δ
#multiple	?
#single	42.4% <50%> (+0.02%)	⬆️

Impacted Files	Coverage Δ
pandas/core/generic.py	38.97% <50%> (-55.31%)	⬇️
pandas/io/formats/latex.py	0% <0%> (-100%)	⬇️
pandas/io/gcs.py	0% <0%> (-100%)	⬇️
pandas/io/sas/sas_constants.py	0% <0%> (-100%)	⬇️
pandas/core/groupby/categorical.py	0% <0%> (-100%)	⬇️
pandas/tseries/plotting.py	0% <0%> (-100%)	⬇️
pandas/tseries/converter.py	0% <0%> (-100%)	⬇️
pandas/io/s3.py	0% <0%> (-100%)	⬇️
pandas/io/formats/html.py	0% <0%> (-99.38%)	⬇️
pandas/io/sas/sas7bdat.py	0% <0%> (-91.16%)	⬇️
... and 137 more

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