CLN: Remove PY35 flag from pandas.compat

[jschendel]

• xref CLN: remove PY2 #25725
• tests passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff

The PY35 flag is always True after dropping Python 2, as Python 3.5 is now the lowest supported version.

[WillAyd]

lgtm

[codecov]

Codecov Report

Merging #26036 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26036      +/-   ##
==========================================
+ Coverage   91.84%   91.89%   +0.05%     
==========================================
  Files         175      175              
  Lines       52517    52478      -39     
==========================================
- Hits        48232    48224       -8     
+ Misses       4285     4254      -31

Flag	Coverage Δ
#multiple	90.45% <100%> (+0.05%)	⬆️
#single	40.74% <100%> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/compat/__init__.py	77.64% <ø> (-0.26%)	⬇️
pandas/core/computation/expr.py	96.7% <100%> (+8.14%)	⬆️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.79% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.72% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26036 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26036      +/-   ##
==========================================
+ Coverage   91.84%   91.89%   +0.05%     
==========================================
  Files         175      175              
  Lines       52517    52478      -39     
==========================================
- Hits        48232    48224       -8     
+ Misses       4285     4254      -31

Flag	Coverage Δ
#multiple	90.45% <100%> (+0.05%)	⬆️
#single	40.74% <100%> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/compat/__init__.py	77.64% <ø> (-0.26%)	⬇️
pandas/core/computation/expr.py	96.7% <100%> (+8.14%)	⬆️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.79% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.72% <0%> (+0.1%)	⬆️

---

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 9d66bdf...30619bc. Read the comment docs.

[mroeschke]

Thanks @jschendel