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BUG: quoting=csv.QUOTE_NONNUMERIC adds extra decimal places #60699

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@Gabriel-p

Description

@Gabriel-p

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 numpy as np
import csv
from io import StringIO

df = pd.DataFrame({"col": np.array([8.57], dtype="float32")})

buff1 = StringIO()
df.to_csv(buff1)
print(buff1.getvalue())

buff2 = StringIO()
df.to_csv(buff2, quoting=csv.QUOTE_NONNUMERIC)
print(buff2.getvalue())

Issue Description

Extra decimal places are added when csv.QUOTE_NONNUMERIC is used in to_csv() method

Expected Behavior

Output file should store 0,8.57, not 0,8.569999694824219

Installed Versions

INSTALLED VERSIONS

commit : 0691c5c
python : 3.12.8
python-bits : 64
OS : Linux
OS-release : 6.8.0-50-generic
Version : #51~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 21 12:03:03 UTC 2
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : None
LANG : es_ES.UTF-8
LOCALE : es_ES.UTF-8

pandas : 2.2.3
numpy : 2.2.1
pytz : 2024.2
dateutil : 2.9.0.post0
pip : 24.2
Cython : None
sphinx : 8.1.3
IPython : 8.31.0
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : 4.12.3
blosc : None
bottleneck : None
dataframe-api-compat : None
fastparquet : 2024.11.0
fsspec : 2024.12.0
html5lib : 1.1
hypothesis : None
gcsfs : None
jinja2 : 3.1.5
lxml.etree : None
matplotlib : 3.10.0
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
psycopg2 : None
pymysql : None
pyarrow : None
pyreadstat : None
pytest : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : 1.15.0
sqlalchemy : 2.0.37
tables : None
tabulate : 0.9.0
xarray : None
xlrd : None
xlsxwriter : None
zstandard : None
tzdata : 2024.2
qtpy : None
pyqt5 : None

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