Closed
Description
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I have confirmed this bug exists on the latest version of pandas.
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(optional) I have confirmed this bug exists on the master branch of pandas.
Note: Please read this guide detailing how to provide the necessary information for us to reproduce your bug.
Code Sample, a copy-pastable example
pd.DataFrame({1: [0]}).info()Problem description
Stack trace:
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
2894 try:
-> 2895 return self._engine.get_loc(casted_key)
2896 except KeyError as err:
pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()
pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()
KeyError: 0
The above exception was the direct cause of the following exception:
KeyError Traceback (most recent call last)
<ipython-input-21-b154f24c816b> in <module>
----> 1 pd.DataFrame({1: [0]}).info()
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/core/frame.py in info(self, verbose, buf, max_cols, memory_usage, null_counts)
2588 ) -> None:
2589 return DataFrameInfo(
-> 2590 self, verbose, buf, max_cols, memory_usage, null_counts
2591 ).info()
2592
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/io/formats/info.py in info(self)
248 self._non_verbose_repr(lines, ids)
249 else:
--> 250 self._verbose_repr(lines, ids, dtypes, show_counts)
251
252 # groupby dtype.name to collect e.g. Categorical columns
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/io/formats/info.py in _verbose_repr(self, lines, ids, dtypes, show_counts)
333
334 for i, col in enumerate(ids):
--> 335 dtype = dtypes[i]
336 col = pprint_thing(col)
337
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/core/series.py in __getitem__(self, key)
880
881 elif key_is_scalar:
--> 882 return self._get_value(key)
883
884 if is_hashable(key):
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/core/series.py in _get_value(self, label, takeable)
987
988 # Similar to Index.get_value, but we do not fall back to positional
--> 989 loc = self.index.get_loc(label)
990 return self.index._get_values_for_loc(self, loc, label)
991
~/.pyenv/versions/3.7.7/envs/ga/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
2895 return self._engine.get_loc(casted_key)
2896 except KeyError as err:
-> 2897 raise KeyError(key) from err
2898
2899 if tolerance is not None:
KeyError: 0
It seems that this error arises when calling .info() on any DataFrame that has at least one integer column name unless the sorted column names form a sequence of consecutive integers starting at 0.
Expected Output
<class 'pandas.core.frame.DataFrame'>
RangeIndex: 1 entries, 0 to 0
Data columns (total 1 columns):
1 1 non-null int64
dtypes: int64(1)
memory usage: 136.0 bytes
Output of pd.show_versions()
INSTALLED VERSIONS
------------------
commit : db08276bc116c438d3fdee492026f8223584c477
python : 3.7.7.final.0
python-bits : 64
OS : Darwin
OS-release : 19.6.0
Version : Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64
machine : x86_64
processor : i386
byteorder : little
LC_ALL : en_US.utf-8
LANG : en_US.utf-8
LOCALE : en_US.UTF-8
pandas : 1.1.3
numpy : 1.18.2
pytz : 2019.3
dateutil : 2.8.1
pip : 20.1
setuptools : 41.2.0
Cython : None
pytest : 5.4.1
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 2.11.1
IPython : 7.13.0
pandas_datareader: None
bs4 : None
bottleneck : None
fsspec : None
fastparquet : None
gcsfs : None
matplotlib : 3.2.1
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pytables : None
pyxlsb : None
s3fs : None
scipy : 1.4.1
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
numba : 0.48.0