DataFrame.to_csv with empty dataframe probleme quoting

Code Sample, a copy-pastable example if possible

>>>import pandas as pd
>>> pd.DataFrame([""]).to_csv("/tmp/test.csv", header= False, index= False, quoting=3)
[...]Error: single empty field record must be quoted

Problem description

I cannot get an empty csv. There is allways quote for the first row

Expected Output

I should get a csv with an empty row.

Output of pd.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.6.0.final.0 python-bits: 64 OS: Linux OS-release: 4.8.0-45-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: fr_FR.UTF-8 LOCALE: fr_FR.UTF-8

pandas: 0.19.2 nose: 1.3.7 pip: 9.0.1 setuptools: 27.2.0 Cython: 0.25.2 numpy: 1.12.0 scipy: 0.18.1 statsmodels: 0.6.1 xarray: None IPython: 5.1.0 sphinx: 1.5.2 patsy: 0.4.1 dateutil: 2.6.0 pytz: 2016.10 blosc: None bottleneck: 1.2.0 tables: 3.3.0 numexpr: 2.6.1 matplotlib: 2.0.0 openpyxl: 2.4.1 xlrd: 1.0.0 xlwt: 1.2.0 xlsxwriter: 0.9.6 lxml: 3.7.2 bs4: 4.5.3 html5lib: None httplib2: 0.10.3 apiclient: 1.6.2 sqlalchemy: 1.1.5 pymysql: None psycopg2: None jinja2: 2.9.4 boto: 2.45.0 pandas_datareader: None

[jreback]

I think this is a bug, so marked. @parisni welcome to have a PR to fix! (code is actually not bad for writing csvs…)

[mroeschke]

This looks fixed on master. Could use a test

In [3]: In [8]: pd.DataFrame([None, None]).to_csv(None, header= False, index= False, na_rep='')
Out[3]: '""\n""\n'