Hello,

I'm newbie in Panda. I want to groupby my dataframe poll_df by Start Date. I get this error. How can I fix it?

Thanks for your help

Code Sample, a copy-pastable example if possible

poll_df = poll_df.groupby(['Start Date'],as_index=False)

Problem description

AttributeError Traceback (most recent call last) in () ----> 1 poll_df = poll_df.groupby(['Start Date']) 2 poll_df.head()

C:\ProgramData\Anaconda2\lib\site-packages\pandas\core\groupby.pyc in getattr(self, attr) 671 return self[attr] 672 if hasattr(self.obj, attr): --> 673 return self._make_wrapper(attr) 674 675 raise AttributeError("%r object has no attribute %r" %

C:\ProgramData\Anaconda2\lib\site-packages\pandas\core\groupby.pyc in _make_wrapper(self, name) 685 "using the 'apply' method".format(kind, name, 686 type(self).name)) --> 687 raise AttributeError(msg) 688 689 # need to setup the selection

AttributeError: Cannot access callable attribute 'groupby' of 'DataFrameGroupBy' objects, try using the 'apply' method

Expected Output

Output of pd.show_versions()

INSTALLED VERSIONS

commit: None python: 2.7.14.final.0 python-bits: 64 OS: Windows

pandas: 0.22.0 pytest: 3.3.2 pip: 9.0.1 setuptools: 38.4.0 Cython: 0.27.3 numpy: 1.14.0 scipy: 1.0.0 pyarrow: None xarray: None IPython: 5.4.1 sphinx: 1.6.6 patsy: 0.5.0 dateutil: 2.6.1 pytz: 2017.3 blosc: None bottleneck: 1.2.1 tables: 3.4.2 numexpr: 2.6.4 feather: None matplotlib: 2.1.2 openpyxl: 2.4.10 xlrd: 1.1.0 xlwt: 1.3.0 xlsxwriter: 1.0.2 lxml: 4.1.1 bs4: 4.6.0 html5lib: 1.0.1 sqlalchemy: 1.2.1 pymysql: None psycopg2: None jinja2: 2.10 s3fs: None fastparquet: None pandas_gbq: None pandas_datareader: 0.6.0

Comment From: jorisvandenbossche

@ymhiri For questions how to use pandas, it's better to ask those at for example Stack Overflow or the mailing list (the github issues are for bug reports or enhancement proposals).

If you ask your question in of those other forums, you should also try to provide a self-contained, reproducible example (runnable code that shows the problem).

In this case, your problem is that you are calling groupby and the result of groupby (like poll_df.groupby(['Start Date'],as_index=False).groupby(..). You should only do it once. You can read the docs about groupby here: https://pandas.pydata.org/pandas-docs/stable/10min.html#grouping