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
# var1 column in the Excel file contains TRUE, FALSE, and "blank" cells
df = pd.read_excel('issue_sample.xlsx', dtype={'var1': 'boolean'})Issue Description
When reading a Boolean column with "blanks" from an Excel file, I am getting the following absurd error message:
ValueError: True cannot be cast to bool
Expected Behavior
True should be cast to boolean without any issue...
Installed Versions
INSTALLED VERSIONS
commit : bb1f651
python : 3.8.12.final.0
python-bits : 64
OS : Windows
OS-release : 10
Version : 10.0.22000
machine : AMD64
processor : AMD64 Family 23 Model 96 Stepping 1, AuthenticAMD
byteorder : little
LC_ALL : None
LANG : en
LOCALE : English_United Kingdom.1252
pandas : 1.4.0
numpy : 1.22.2
pytz : 2021.3
dateutil : 2.8.2
pip : 22.0.3
setuptools : 60.7.1
Cython : None
pytest : 6.2.2
hypothesis : None
sphinx : 4.4.0
blosc : None
feather : None
xlsxwriter : 3.0.2
lxml.etree : 4.6.2
html5lib : None
pymysql : None
psycopg2 : 2.8.6
jinja2 : 3.0.3
IPython : 7.31.1
pandas_datareader: None
bs4 : None
bottleneck : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : 3.5.1
numba : None
numexpr : None
odfpy : None
openpyxl : 3.0.5
pandas_gbq : None
pyarrow : None
pyreadstat : None
pyxlsb : None
s3fs : None
scipy : 1.6.3
sqlalchemy : 1.4.31
tables : None
tabulate : None
xarray : None
xlrd : 2.0.1
xlwt : None
zstandard : None