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a = pd.DataFrame([range(3)]*3,index=map(str, range(3))).T a.iloc[:,0] = [10, 11, 11] a.groupby('0').apply(lambda x: print(x.index)) indexes = a.groupby('0').apply(lambda x: x.index) print(indexes) index_lengths = a.groupby('0').apply(lambda x: len(x.index)) print(index_lengths) indexes_lengths = a.groupby('0').apply(lambda x: x.index).apply(len) print(indexes_lengths) assert indexes_lengths.equals(index_lengths), "Apply indexes are returning the wrong index"
Groupby indexing is returning the wrong value. It is returning the indexes of the last group for all the groups.
0 10 Int64Index([0], dtype='int64') 11 Int64Index([1, 2], dtype='int64')
pd.show_versions()
commit : None python : 3.6.8.final.0 python-bits : 64 OS : Linux OS-release : 5.2.0-arch2-1-ARCH machine : x86_64 processor : byteorder : little LC_ALL : None LANG : C LOCALE : None.None
pandas : 0.25.1 numpy : 1.15.4 pytz : 2019.1 dateutil : 2.8.0 pip : 19.1.1 setuptools : 41.0.1 Cython : 0.28.5 pytest : None hypothesis : None sphinx : None blosc : None feather : 0.4.0 xlsxwriter : None lxml.etree : 4.3.4 html5lib : None pymysql : None psycopg2 : 2.8.3 (dt dec pq3 ext lo64) jinja2 : 2.10.1 IPython : 7.5.0 pandas_datareader: None bs4 : None bottleneck : 1.2.1 fastparquet : None gcsfs : None lxml.etree : 4.3.4 matplotlib : 2.2.2 numexpr : 2.6.9 odfpy : None openpyxl : None pandas_gbq : None pyarrow : 0.13.0 pytables : None s3fs : 0.1.5 scipy : 1.3.1 sqlalchemy : None tables : 3.4.4 xarray : None xlrd : 1.2.0 xlwt : None xlsxwriter : None
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Code Sample, a copy-pastable example if possible
Problem description
Groupby indexing is returning the wrong value. It is returning the indexes of the last group for all the groups.
Expected Output
Output of
pd.show_versions()
INSTALLED VERSIONS
commit : None
python : 3.6.8.final.0
python-bits : 64
OS : Linux
OS-release : 5.2.0-arch2-1-ARCH
machine : x86_64
processor :
byteorder : little
LC_ALL : None
LANG : C
LOCALE : None.None
pandas : 0.25.1
numpy : 1.15.4
pytz : 2019.1
dateutil : 2.8.0
pip : 19.1.1
setuptools : 41.0.1
Cython : 0.28.5
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : 0.4.0
xlsxwriter : None
lxml.etree : 4.3.4
html5lib : None
pymysql : None
psycopg2 : 2.8.3 (dt dec pq3 ext lo64)
jinja2 : 2.10.1
IPython : 7.5.0
pandas_datareader: None
bs4 : None
bottleneck : 1.2.1
fastparquet : None
gcsfs : None
lxml.etree : 4.3.4
matplotlib : 2.2.2
numexpr : 2.6.9
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : 0.13.0
pytables : None
s3fs : 0.1.5
scipy : 1.3.1
sqlalchemy : None
tables : 3.4.4
xarray : None
xlrd : 1.2.0
xlwt : None
xlsxwriter : None
The text was updated successfully, but these errors were encountered: