Pandas If duplicate on same row, lookup value from another dataframe Question: I have this scenario in mind but I don’t know how to go about it. When a value in column changeme is equal to the one from the lookforme column on the same row in df1, I would like to lookup that value …
Update Pandas df Given String Query Question: As a result of data introduced by users in the interface I have a string query-like. query = ‘(ColA==”7″) & (ColB==”3″) & (ColC==”alpha”) & (ColD==”yu”)’ Now I want to update a column of the df based on those conditions, assigning it a variable Z. I don’t know if …
python pandas loc – filter for list of values Question: This should be incredibly easy, but I can’t get it to work. I want to filter my dataset on two or more values. #this works, when I filter for one value df.loc[df[‘channel’] == ‘sale’] #if I have to filter, two separate columns, I can do …
Python: Pandas Series – Why use loc? Question: Why do we use ‘loc’ for pandas dataframes? it seems the following code with or without using loc both compile anr run at a simulular speed %timeit df_user1 = df.loc[df.user_id==’5561′] 100 loops, best of 3: 11.9 ms per loop or %timeit df_user1_noloc = df[df.user_id==’5561′] 100 loops, best …
How are iloc and loc different? Question: Can someone explain how these two methods of slicing are different? I’ve seen the docs, and I’ve seen these answers, but I still find myself unable to understand how the three are different. To me, they seem interchangeable in large part, because they are at the lower levels …
