How to create python script which can create csv we file with relationship

[Sonu]

hello,
i need to create script
that can create a csv file as i want
for example i have two table in database that are person ,country
if i want to create csv file to person,then wht to do ,,
how to connect database,how to create csv of interrelated field
eg :in person table :country_id (which is primary key of country table)