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Showing content from https://github.com/pandas-dev/pandas/issues/32380 below:

Deprecate groupby() squeeze option · Issue #32380 · pandas-dev/pandas · GitHub

Code Sample 
import pandas as pd
print(pd.DataFrame([{
    'A': 1,
    'B': 1,
}, {
    'A': 2,
    'B': 2,
}, {
    'A': 2,
    'B': 3,
}]).groupby('A', squeeze=True).count())
Problem description

I expected .groupby(squeeze=True) to, well, squeeze, and count() to return a Series. Instead squeeze=True doesn't seem to do anything, and count() returns a DataFrame.

A workaround is to write .groupby('A').count().squeeze(), which does work.

Expected Output 
A
1    1
2    2
Name: B, dtype: int64
Actual output Output of pd.show_versions() INSTALLED VERSIONS ------------------ commit : None python : 3.7.6.final.0 python-bits : 64 OS : Linux OS-release : 5.4.0-4-amd64 machine : x86_64 processor : byteorder : little LC_ALL : None LANG : en_GB.UTF-8 LOCALE : en_GB.UTF-8

pandas : 1.0.1
numpy : 1.17.4
pytz : 2019.3
dateutil : 2.8.1
pip : 18.1
setuptools : 44.0.0
Cython : None
pytest : 4.6.9
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : 4.5.0
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 2.11.1
IPython : 7.12.0
pandas_datareader: None
bs4 : None
bottleneck : None
fastparquet : None
gcsfs : None
lxml.etree : 4.5.0
matplotlib : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pytables : None
pytest : 4.6.9
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
xlwt : None
xlsxwriter : None
numba : None

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