[Python] Not enough arguments for format string error when inserting list into database SQL...

I'm trying to insert a list into separate columns of a database

print inserter
params = ['%s' for item in inserter]
sql_query = 'INSERT INTO tablename (column1, column2, column3, column4, column5, column6, column7) VALUES (%s,%s,%s,%s,%s,%s,%s);' % ','.join(params)
cursor.execute(sql_query)
db.commit


But I keep getting the error:

not enough arguments for format string
​

Does anyone know what I am doing wrong?

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