Agreggation Groupby #1: get total sum

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Sat Jan 23 2021 20:26:26 GMT+0000 (Coordinated Universal Time)

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df.groupby('ID', as_index=False)['Value'].sum()
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https://towardsdatascience.com/basic-data-analysis-techniques-every-data-analyst-should-know-using-python-4de80ab52396