Description
Pandas version checks
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
>>> import pandas as pd
>>> import numpy as np
>>> arr = pd.arrays.SparseArray([0,1,np.nan,1])
>>> pd.core.algorithms.duplicated(arr)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/pandas/pandas/core/algorithms.py", line 1063, in duplicated
values = _ensure_data(values)
File "/home/pandas/pandas/core/algorithms.py", line 177, in _ensure_data
if values.dtype.itemsize in [2, 12, 16]: # type: ignore[union-attr]
AttributeError: 'SparseDtype' object has no attribute 'itemsize'Same thing happens with pd.Series(arr).duplicated()
Issue Description
_ensure_data tries to access dtype.itemsize for float types. SparseArray can be considered a float type, but doesn't implement an itemsize attribute. Addressing #48424 may solve this, but the itemsize attribute is also causing an issue in #42070
Expected Behavior
Returns without error
Installed Versions
INSTALLED VERSIONS
commit : 24da5be
python : 3.8.13.final.0
python-bits : 64
OS : Linux
OS-release :
Version : #1 SMP Wed Mar 2 00:30:59 UTC 2022
machine : x86_64
processor : x86_64
byteorder : little
LC_ALL : C.UTF-8
LANG : C.UTF-8
LOCALE : en_US.UTF-8
pandas : 1.6.0.dev0+203.g24da5be949.dirty
numpy : 1.22.4
pytz : 2022.2.1
dateutil : 2.8.2
setuptools : 65.3.0
pip : 22.2.2
Cython : 0.29.32
pytest : 7.1.3
hypothesis : 6.54.6
sphinx : 4.5.0
blosc : None
feather : None
xlsxwriter : 3.0.3
lxml.etree : 4.9.1
html5lib : 1.1
pymysql : 1.0.2
psycopg2 : 2.9.3
jinja2 : 3.0.3
IPython : 8.5.0
pandas_datareader: 0.10.0
bs4 : 4.11.1
bottleneck : 1.3.5
brotli :
fastparquet : 0.8.3
fsspec : 2021.11.0
gcsfs : 2021.11.0
matplotlib : 3.6.0
numba : 0.55.2
numexpr : 2.8.3
odfpy : None
openpyxl : 3.0.10
pandas_gbq : 0.17.8
pyarrow : 9.0.0
pyreadstat : 1.1.9
pyxlsb : 1.0.9
s3fs : 2021.11.0
scipy : 1.9.1
snappy :
sqlalchemy : 1.4.41
tables : 3.7.0
tabulate : 0.8.10
xarray : 2022.6.0
xlrd : 2.0.1
xlwt : 1.3.0
zstandard : 0.18.0
tzdata : None