DOC: Error msg using Python keyword in numexpr query #18221

[WillAyd]

• closes df.query() does not support column name 'class' #18221
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[jreback]

note if you are up for it, #6508 and this issue could be dealt with by allowing a string on the lhs, e.g.
df.query('"class" > 0') for spaces / non-keywords.

[jreback]

cc @chris-b1

[codecov]

Codecov Report

Merging #18248 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #18248      +/-   ##
==========================================
- Coverage   91.43%   91.41%   -0.02%     
==========================================
  Files         164      164              
  Lines       50090    50096       +6     
==========================================
- Hits        45798    45796       -2     
- Misses       4292     4300       +8

Flag	Coverage Δ
#multiple	89.22% <100%> (ø)	⬆️
#single	40.38% <85.71%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/frame.py	97.8% <ø> (-0.1%)	⬇️
pandas/core/computation/expr.py	88.65% <100%> (+0.17%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/indexes/datetimes.py	95.48% <0%> (+0.09%)	⬆️

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[codecov]

Codecov Report

Merging #18248 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #18248      +/-   ##
==========================================
- Coverage   91.43%   91.41%   -0.02%     
==========================================
  Files         164      164              
  Lines       50090    50096       +6     
==========================================
- Hits        45798    45796       -2     
- Misses       4292     4300       +8

Flag	Coverage Δ
#multiple	89.22% <100%> (ø)	⬆️
#single	40.38% <85.71%> (-0.06%)	⬇️

Impacted Files	Coverage Δ
pandas/core/frame.py	97.8% <ø> (-0.1%)	⬇️
pandas/core/computation/expr.py	88.65% <100%> (+0.17%)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/indexes/datetimes.py	95.48% <0%> (+0.09%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[jreback]

thanks @WillAyd

[Atcold]

Is this working? I get a '>' not supported between instances of 'str' and 'int' error.

[WillAyd]

If you think it’s not working I’d suggest opening a new issue with the required information and someone will take a look