python add columns to dataframe without changing the original

1#given an original pandas.DataFrame named 'df', and the data series that we want to associate with the new column named 's', 3 possible solutions:
2
3#1-Use "assign()" to create new column and then assign values to it
4df_w_new_col = df.assign (name='New_Col')
5
6#2-create an aditional Dataframe with just the new column to add and concatenate with the old dataframe. Like a great majority of pandas methods, this actually creates a new df, it does not just concatenate to the old one so it is safe to change the old and new df's independetly
7df = pd.concat( [df, pd.DataFrame({'New_Col:s})], axis=1 )
8
9#3-explicitely create a copy and append a column
10df2 = df.copy()
11df2['New_Col'] = s