to_html(index_names=False) still renders a row with index names

[CRP]

The index_names parameter is apparently ignored.
I tried to debug the code, and it looks like line 1291 of pandas/io/formats/format.py should contain "and self.fmt.show_index_names" in the if clause.

here is sample code:

x=DataFrame(np.random.randn(3,4),columns=list('abcd'))
x.index.name='pippo'
print(x.to_html(index_names=False))

which produces the following output:

	a	b	c	d
pippo
0	1.715511	-1.582624	0.027399	-0.276980
1	-0.003603	-1.227605	0.434763	0.039167
2	0.246343	-0.062897	-0.724532	-0.352672

the second row of the thead should not be there...

INSTALLED VERSIONS ------------------ commit: None python: 3.6.1.final.0 python-bits: 64 OS: Darwin OS-release: 16.6.0 machine: x86_64 processor: i386 byteorder: little LC_ALL: en_US.UTF-8 LANG: en_US.UTF-8 LOCALE: en_US.UTF-8

pandas: 0.20.1
pytest: None
pip: 9.0.1
setuptools: 35.0.2
Cython: None
numpy: 1.12.1
scipy: 0.19.0
xarray: 0.9.5
IPython: 6.0.0
sphinx: None
patsy: 0.4.1
dateutil: 2.6.0
pytz: 2017.2
blosc: None
bottleneck: None
tables: 3.4.2
numexpr: 2.6.2
feather: None
matplotlib: 2.0.2
openpyxl: 2.4.7
xlrd: 1.0.0
xlwt: 1.2.0
xlsxwriter: 0.9.6
lxml: None
bs4: None
html5lib: 0.999999999
sqlalchemy: 1.1.9
pymysql: None
psycopg2: None
jinja2: 2.9.6
s3fs: None
pandas_gbq: None
pandas_datareader: None

[TomAugspurger]

May be as simple as also checking self.fmt.index_names in https://github.com/pandas-dev/pandas/blob/e41fe7f52a7ae6be962e683f40500624b2ba2cf6/pandas/io/formats/format.py#L1295 (and tests).

@CRP interested in submitting a fix?

[CRP]

just created pull request, not sure if I did everything right...