How to merge cells into a single one with Pandas?

Question

I'm trying to 'merge' the item section into a list according to the Transaction ID. So, I want Chocolate Quente and Jam on a list.

Answer 1

Can you try the following: item_list=df[df["Transaction"]==3]["Item"].to_list() or list(df[df["Transaction"]==3]["Item"]

I suppose this should work if 3 is an int type. If it's an object (string), use double quotes "3".

Answer 2

df.groupby('Transaction')['Item'].apply(list).reset_index()