title: Compare two excel files in Pandas and return the rows which have the same values in TWO columns
body: <p>I have a couple of excel files. Both the files have two common columns: Customer_Name and Customer_No. The first excel file has around 800k rows while the second has only 460. I want to get a dataframe which has the common data in both the files, ie obtain the rows from the first file that has both the Customer_Name and Customer_No. found in the 2nd file. I tried using .isin but so far I found examples using only a single variable(Column). Thanks in advance!</p>