CLN: replace %s syntax with .format in pandas.core.indexes

[makeajourney]

progress towards #16130

• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff

[codecov]

Codecov Report

Merging #26159 into master will decrease coverage by 51.25%.
The diff coverage is 25%.

@@             Coverage Diff             @@
##           master   #26159       +/-   ##
===========================================
- Coverage      92%   40.74%   -51.26%     
===========================================
  Files         175      175               
  Lines       52371    52371               
===========================================
- Hits        48184    21340    -26844     
- Misses       4187    31031    +26844

Flag	Coverage Δ
#multiple	?
#single	40.74% <25%> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/multi.py	33.92% <0%> (-61.69%)	⬇️
pandas/core/indexes/frozen.py	61.84% <0%> (-30.27%)	⬇️
pandas/core/indexes/base.py	55.55% <40%> (-41.44%)	⬇️
pandas/io/formats/latex.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/formats/html.py	0% <0%> (-99.37%)	⬇️
pandas/io/sas/sas7bdat.py	0% <0%> (-91.16%)	⬇️
... and 133 more

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[codecov]

Codecov Report

Merging #26159 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26159      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52372    52372              
==========================================
- Hits        48176    48173       -3     
- Misses       4196     4199       +3

Flag	Coverage Δ
#multiple	90.53% <100%> (ø)	⬆️
#single	40.7% <25%> (-0.16%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/multi.py	95.61% <100%> (ø)	⬆️
pandas/core/indexes/frozen.py	92.1% <100%> (ø)	⬆️
pandas/core/indexes/base.py	96.99% <100%> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.71% <0%> (+0.1%)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[jreback]

this has some failures (ignore the 3.7 numpy_dev ones for now), but the others are legit

[jreback]

can you merge master

[jbrockmendel]

can you use a kwarg other than list here to avoid overlap with builtin name

[jreback]

closing as stale; ping if you want to continue