pd.MultiIndex.get_loc(np.nan) · Issue #19132 · pandas-dev/pandas (original) (raw)

Code Sample, a copy-pastable example if possible

In [2]: mi = pd.MultiIndex.from_product([[np.nan, 1]] * 3)

In [3]: mi.get_loc(np.nan)

KeyError Traceback (most recent call last) /home/pietro/nobackup/repo/pandas/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance) 2513 try: -> 2514 return self._engine.get_loc(key) 2515 except KeyError:

/home/pietro/nobackup/repo/pandas/pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5834)()

/home/pietro/nobackup/repo/pandas/pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5639)()

/home/pietro/nobackup/repo/pandas/pandas/_libs/index_class_helper.pxi in pandas._libs.index.Int64Engine._check_type (pandas/_libs/index.c:19008)()

KeyError: nan

During handling of the above exception, another exception occurred:

KeyError Traceback (most recent call last) in () ----> 1 mi.get_loc(np.nan)

/home/pietro/nobackup/repo/pandas/pandas/core/indexes/multi.py in get_loc(self, key, method) 2121 2122 if not isinstance(key, tuple): -> 2123 loc = self._get_level_indexer(key, level=0) 2124 return _maybe_to_slice(loc) 2125

/home/pietro/nobackup/repo/pandas/pandas/core/indexes/multi.py in _get_level_indexer(self, key, level, indexer) 2411 else: 2412 -> 2413 loc = level_index.get_loc(key) 2414 if isinstance(loc, slice): 2415 return loc

/home/pietro/nobackup/repo/pandas/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance) 2514 return self._engine.get_loc(key) 2515 except KeyError: -> 2516 return self._engine.get_loc(self._maybe_cast_indexer(key)) 2517 2518 indexer = self.get_indexer([key], method=method, tolerance=tolerance)

/home/pietro/nobackup/repo/pandas/pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5834)()

/home/pietro/nobackup/repo/pandas/pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc (pandas/_libs/index.c:5639)()

/home/pietro/nobackup/repo/pandas/pandas/_libs/index_class_helper.pxi in pandas._libs.index.Int64Engine._check_type (pandas/_libs/index.c:19008)()

KeyError: nan

Problem description

Opening a separate issue from #18485 (full label containing NaN) because, differently from that, this is not fixed by #19074.

xref #5286 because they are probably worth testing together.

Expected Output

slice(0, 4, None)

Output of pd.show_versions()

INSTALLED VERSIONS

commit: None
python: 3.5.3.final.0
python-bits: 64
OS: Linux
OS-release: 4.9.0-5-amd64
machine: x86_64
processor:
byteorder: little
LC_ALL: None
LANG: en_GB.UTF-8
LOCALE: en_GB.UTF-8

pandas: 0.22.0.dev0+448.gdbec3c92e
pytest: 3.0.6
pip: 9.0.1
setuptools: 33.1.1
Cython: 0.25.2
numpy: 1.12.1
scipy: 0.18.1
pyarrow: None
xarray: None
IPython: 5.2.2
sphinx: None
patsy: 0.4.1+dev
dateutil: 2.6.0
pytz: 2016.10
blosc: None
bottleneck: 1.2.0
tables: 3.3.0
numexpr: 2.6.1
feather: 0.3.1
matplotlib: 2.0.0
openpyxl: 2.3.0
xlrd: 1.0.0
xlwt: 1.2.0
xlsxwriter: None
lxml: 3.7.1
bs4: 4.5.3
html5lib: 0.999999999
sqlalchemy: 1.0.15
pymysql: None
psycopg2: None
jinja2: 2.8
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: None