Description
Code Sample, a copy-pastable example if possible
>>> import pandas as pd
>>> index = pd.CategoricalIndex([], [0])
>>> pd.Series(index=index).reindex(index=[0])
Traceback (most recent call last):
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2733, in reindex
**kwargs)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/generic.py", line 2515, in reindex
fill_value, copy).__finalize__(self)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2679, in _reindex_axes
fill_value, limit, tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2687, in _reindex_index
tolerance=tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 422, in reindex
new_target = self.take(indexer)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 560, in take
na_value=-1)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 1806, in _assert_take_fillable
taken = values.take(indices)
IndexError: cannot do a non-empty take from an empty axes.
>>> pd.DataFrame(index=index).reindex(index=[0])
Traceback (most recent call last):
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2733, in reindex
**kwargs)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/generic.py", line 2515, in reindex
fill_value, copy).__finalize__(self)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2679, in _reindex_axes
fill_value, limit, tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2687, in _reindex_index
tolerance=tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 422, in reindex
new_target = self.take(indexer)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 560, in take
na_value=-1)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 1806, in _assert_take_fillable
taken = values.take(indices)
IndexError: cannot do a non-empty take from an empty axes.
>>> pd.DataFrame(columns=index).reindex(columns=[0])
Traceback (most recent call last):
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2733, in reindex
**kwargs)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/generic.py", line 2515, in reindex
fill_value, copy).__finalize__(self)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2679, in _reindex_axes
fill_value, limit, tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/frame.py", line 2687, in _reindex_index
tolerance=tolerance)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 422, in reindex
new_target = self.take(indexer)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/category.py", line 560, in take
na_value=-1)
File "~/miniconda3/envs/pantheon/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 1806, in _assert_take_fillable
taken = values.take(indices)
IndexError: cannot do a non-empty take from an empty axes.Problem description
Reindexing a series or frame with an empty CategoricalIndex throws an error. This behaviour is inconsistent with other indexes, which can reindex an empty series or frame without error. While it is of course possible to work around this issue, it requires unnecessarily complex code when the size of the input is not known in advance.
Expected Output
No errors thrown, objects reindexed.
Output of pd.show_versions()
INSTALLED VERSIONS
commit: None
python: 3.6.1.final.0
python-bits: 64
OS: Linux
OS-release: 4.10.10-100.fc24.x86_64
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: C
LANG: C
LOCALE: None.None
pandas: 0.20.2
pytest: None
pip: 9.0.1
setuptools: 33.1.1.post20170320
Cython: 0.25.2
numpy: 1.13.0
scipy: 0.19.0
xarray: None
IPython: 4.2.1
sphinx: None
patsy: 0.4.1
dateutil: 2.6.0
pytz: 2017.2
blosc: None
bottleneck: None
tables: None
numexpr: None
feather: None
matplotlib: 2.0.2
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: 0.999
sqlalchemy: None
pymysql: None
psycopg2: None
jinja2: 2.9.5
s3fs: None
pandas_gbq: None
pandas_datareader: None