Pandas-groupby Questions

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pandas groupby with length of lists

I need display in dataframe columns both the user_id and length of content_id which is a list object. but struggling to do using groupby. please
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Split CSV by unique columns

I ran into a problem trying to split my csv into the minimum value of csv files so each has only unique ids in it by running
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Groupby within groups

I have data like this: df = pd.dataframe({ 'a': ['milk', 'eggs', 'eggs', 'butter', 'butter', 'milk', 'eggs', 'eggs',
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How to groupby a list?

For example, if we have a list of a lot of names. how to count occurrences in a sequence? or more exactly, how to use groupby to sort the list and
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Looking at Previous Time series

I have a dataset as shown below. the idea is looking at every previous 15minutes not the frequency which we use in grouper function. i want to see

python access a column after groupby

I would like to replace null value of stadium attendance (affluence in french) with their means. therefore i do this to have the mean by seasons /
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