How to match the positions of two columns?

Python
#1

Hey everyone, I sometimes encounter a problem where I need to find the positions where values of two columns match in Pandas. To solve this issue, I discovered a method in Pandas called loc() which uses boolean indexing to create a mask that is True where values of columns A and B match, and then uses the loc method to select the rows where the mask is True. Here is an example of the code that I used to accomplish this:

Is it possible to use different methods or functions to accomplish this task?

#2

Yes, there are alternative methods to achieve this task. One way is to use the query method, which compares the columns A and B using a string expression. Here is an example of how to use it:

The query method returns a dataframe containing only the rows where the expression is True. The indices of these rows can then be extracted using the index attribute.