Category:1908 novels
Category:Fictional Serbian people
Category:Serbian novels
Category:Novels by Dinko Simunovic
Category:20th-century Serbian novelsQ:
How to get "Before" and "After" difference in pandas?
I am trying to get the "Before" and "After" difference for a dataframe with a column named 'Group_Name' which can be repeated a few times in the dataframe. The dataframe is as shown below: be359ba680
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