I have a couple df(a,b,c, ...z) which all have different columns but the same a_id and b_id which b_id may have missing values. I wanted to each of the df's to left join with the same df1 to pick up the missing values, and warns me if there still are missing values in new df1a,df1b, df1c...
What is the most pythonic way to do it?
