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BUG: read_csv raises on bad line when should skip or warn #47073

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2 of 3 tasks
arekkulczycki opened this issue May 20, 2022 · 0 comments
Open
2 of 3 tasks

BUG: read_csv raises on bad line when should skip or warn #47073

arekkulczycki opened this issue May 20, 2022 · 0 comments
Labels
Bug IO CSV read_csv, to_csv

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@arekkulczycki
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Pandas version checks

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

import pandas as pd
from io import StringIO

csv = 'col1,col2\n""malformed","quotes"",'
io = StringIO(csv)

pd.read_csv(io, on_bad_lines="skip")  # or alternatively "warn"

# ParserError: Error tokenizing data. C error: EOF inside string starting at row 1

Issue Description

The combination of

  • malformed text with quotes and a delimiter hidden in between
  • doublequote=True
  • on_bad_lines="skip"

raises a ParserError instead of skipping the malformed row.

Expected Behavior

The reader skips the malformed row and reads the csv successfully.

Installed Versions

commit : 4bfe3d0
python : 3.8.10.final.0
python-bits : 64
OS : Linux
OS-release : 5.4.0-89-generic
Version : #100 SMP Fri Sep 24 14:50:10 UTC 2021
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : pl_PL.UTF-8
LOCALE : pl_PL.UTF-8

pandas : 1.4.2
numpy : 1.22.3
pytz : 2022.1
dateutil : 2.8.2
pip : 20.0.2
setuptools : 45.2.0
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : None
IPython : 8.3.0
pandas_datareader: None
bs4 : 4.8.2
bottleneck : None
brotli : None
fastparquet : None
fsspec : None
gcsfs : None
markupsafe : 1.1.0
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : None
snappy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
zstandard : None

@arekkulczycki arekkulczycki added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels May 20, 2022
@simonjayhawkins simonjayhawkins added the IO CSV read_csv, to_csv label May 20, 2022
@topper-123 topper-123 removed the Needs Triage Issue that has not been reviewed by a pandas team member label Feb 15, 2023
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Labels
Bug IO CSV read_csv, to_csv
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