Pandas Questions

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Find index of max() after groupby

Is there a possibility to find the index after a groupby. so in other words i use a groupby function to find max values, but i would like to find
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How to remove url's from string

Currently i have many rows in one column similar to the string below. on python i have run the code to remove , <a, href=, and the url
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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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Un-melt a pandas dataframe

Let say i have below dataframe import pandas as pd >>> pd.dataframe({'product_name': ['laptop', 'printer',
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