CLN: remove __unicode__ from pyx, etc. files

[topper-123]

• xref CLN: remove PY2 #25725

Removes use of __unicode__ from the all pyx, pxi pxi.in etc type files.

This pattern was almost not used in the non-.py type files.

[codecov]

Codecov Report

Merging #26416 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26416      +/-   ##
==========================================
- Coverage   91.69%   91.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       50739    50739              
==========================================
- Hits        46524    46520       -4     
- Misses       4215     4219       +4

Flag	Coverage Δ
#multiple	90.19% <ø> (ø)	⬆️
#single	41.18% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26416 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26416      +/-   ##
==========================================
- Coverage   91.69%   91.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       50739    50739              
==========================================
- Hits        46524    46520       -4     
- Misses       4215     4219       +4

Flag	Coverage Δ
#multiple	90.19% <ø> (ø)	⬆️
#single	41.18% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ff4437e...d965f5d. Read the comment docs.

[topper-123]

The MacOs error in a connection issue, so unrelated.

[WillAyd]

Restarted that to be safe. Do we have tests that hit this? IIRC the semantics for Cython don't 100% follow Python when it comes to str / unicode handling even with the language_level being set to 3 in our configuration, so would be good to double check these

[TomAugspurger]

I suspect there won't be any strange Cython interaction. __unicode__ was just a pandas thing. It doesn't have any special meaning in python / Cython.

[jreback]

thanks @topper-123