Inserting variable into - Mailing list psycopg

Hello,

I'd like to use a variable for 'Big Company' (e.g. account) or where = statements generally in my cur.execute
statements:

cur.execute("SELECT SUM(revusd) FROM sfdc where saccount = 'Big Company' AND stage LIKE 'Commit%';")
commitd1 = cur.fetchone()
conn.commit()

but I don't know the proper syntax with the cur.execute statement to use a variable.

I imagine others do  - thanks!

Best,

Hagen