Skip to content

iloc doesn't error when boolean mask is too long #27020

Closed
@NicolasHug

Description

@NicolasHug

iloc doesn't error when passing a boolean mask that is too long (as long as the values are False). The same is true for Series.

import pandas as pd
d = pd.DataFrame([1, 2])
d.iloc[[True, True, False]]  # does not error even though index is too long
d.iloc[[True, True, True]]  # error as expected

Sorry, not sure if this is an expected behaviour, but I was quite surprised at first.

Output of pd.show_versions()

INSTALLED VERSIONS

commit: None
python: 3.7.3.final.0
python-bits: 64
OS: Linux
OS-release: 5.1.4-arch1-1-ARCH
machine: x86_64
processor:
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.24.2
pytest: 4.6.2
pip: 19.0.3
setuptools: 40.8.0
Cython: 0.29.10
numpy: 1.16.2
scipy: 1.3.0
pyarrow: None
xarray: None
IPython: 7.4.0
sphinx: 3.0.0
patsy: 0.5.1
dateutil: 2.8.0
pytz: 2018.9
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: 3.1.0
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml.etree: None
bs4: None
html5lib: None
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.10
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None
gcsfs: None

Metadata

Metadata

Assignees

No one assigned

    Labels

    No labels
    No labels

    Type

    No type

    Projects

    No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions