Python/psycopg2 WHERE IN statement

Question

What is the correct method to have the list (countryList) be available via %s in the SQL statement?

# using psycopg2
countryList=['UK','France']

sql='SELECT * from countries WHERE country IN (%s)'
data=[countryList]
cur.execute(sql,data)

As it is now, it errors out after trying to run "WHERE country in (ARRAY[...])". Is there a way to do this other than through string manipulation?

Thanks

Answer 1

For the IN operator, you want a tuple instead of list, and remove parentheses from the SQL string.

# using psycopg2
data=('UK','France')

sql='SELECT * from countries WHERE country IN %s'
cur.execute(sql,(data,))

During debugging you can check that the SQL is built correctly with

cur.mogrify(sql, (data,))