BUG: Standardize malformed row handling in Python engine

[gfyoung]

Wrap next(source) when source is a file-buffer object to allow for more uniform error message displaying in the Python engine. Closes #15910.

[jreback]

this is a plain Exception? shouldn't it be a ValueError?

[gfyoung]

Copied from where it was originally, which according to the blame was refactored by you! 😄

In any case, I agree: we should just remove that line and raise csv.Error now

[jreback]

hmm don't remember that :)

[jreback]

yeah csv.Error sounds fine

make a note of this in the whatsnew though

[gfyoung]

Yep, done.

[codecov]

Codecov Report

Merging #15913 into master will increase coverage by <.01%.
The diff coverage is 95.65%.

@@            Coverage Diff             @@
##           master   #15913      +/-   ##
==========================================
+ Coverage   90.95%   90.96%   +<.01%     
==========================================
  Files         145      145              
  Lines       49534    49531       -3     
==========================================
- Hits        45056    45055       -1     
+ Misses       4478     4476       -2

Flag	Coverage Δ
#multiple	88.72% <95.65%> (ø)	⬆️
#single	40.63% <4.34%> (-0.03%)	⬇️

Impacted Files	Coverage Δ
pandas/io/parsers.py	95.65% <95.65%> (+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 ba30e3a...884387e. Read the comment docs.

[gfyoung]

@jreback : Everything is green and ready to go.

[jreback]

thanks @gfyoung