How to Define f500_sel?

just corius about how to define or how to implment to create data frame “f500_sel” and how that is imposibble?

I don’t understand what you mean by this but what I can’t tell you is that f500_sel has already been saved as a dataframe from the selection of data from f500 s you don’t need to bother yourself again. your task is to find the counts of the country in f500_sel and assign it to a variable called countries which can be done by selecting the country column from the dataframe of f500_sel.

countries = f500_sel[“country”]

and finding the value_count

country_counts = countries.value_counts()