Description
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
import csv
import sys
data = [['a', 'b"c', 'def"'], ['a2', None, '"c']]
# no escaping
df = pd.DataFrame(data)
print(df.to_csv(sep='\t', index=False, header=False, quotechar='"', escapechar='\\', quoting=csv.QUOTE_NONE))
print(df.to_csv(sep='\t', index=False, header=False, quotechar='"', escapechar='\\', quoting=csv.QUOTE_NONE, doublequote=False))
# escaping
csv_writer = csv.writer(sys.stdout, delimiter='\t', quotechar='"', escapechar='\\', quoting=csv.QUOTE_NONE)
for r in data:
_ = csv_writer.writerow(r)Issue Description
to_csv() doesn't escape quotechar when quoting=csv.QUOTE_NONE.
a b"c def"
a2 "c
Expected Behavior
quotechar gets escaped using escapechar even when quoting=csv.QUOTE_NONE.
This is the behavior of the csv module.
a b\"c def\"
a2 \"c
Installed Versions
INSTALLED VERSIONS
commit : 0691c5c
python : 3.11.2
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22621
machine : AMD64
processor : Intel64 Family 6 Model 140 Stepping 1, GenuineIntel
byteorder : little
LC_ALL : None
LANG : en_US.UTF-8
LOCALE : English_United States.1252
pandas : 2.2.3
numpy : 1.26.2
pytz : 2023.3.post1
dateutil : 2.8.2
pip : 25.0.1
Cython : None
sphinx : None
IPython : 8.24.0
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : 4.12.3
blosc : None
bottleneck : None
dataframe-api-compat : None
fastparquet : None
fsspec : None
html5lib : None
hypothesis : None
gcsfs : None
jinja2 : None
lxml.etree : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : 3.1.5
pandas_gbq : None
psycopg2 : 2.9.9
pymysql : None
pyarrow : None
pyreadstat : None
pytest : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : 2.0.23
tables : None
tabulate : None
xarray : None
xlrd : None
xlsxwriter : None
zstandard : None
tzdata : 2023.3
qtpy : None
pyqt5 : None