Automagically expanding a Python list with formatted output
Does anyone know if there's a way to automatically expand a list in Python, separated by commas? I'm writing some Python code that uses the MySQLdb library, and I'm trying to dynamically update a list of rows in a MySQL database with certain key values.
For instance, in the code below, I'd like to have the numeric values in the record_ids list expand into a SQL "IN" clause.
import MySQLdb record_ids = [ 23, 43, 71, 102, 121, 241 ] mysql = MySQLdb.connect(user="username", passwd="secret", db="apps") mysql_cursor = mysql.cursor() sqlStmt="UPDATE apps.sometable SET lastmod=SYSDATE() where rec_id in ( %s )" mysql_cursor.execute( sqlStmt, record_ids ) mysql.commit()
Any help would be appreciated!
",".join( map(str, record_ids) )
",".join( list_of_strings ) joins a list of string by separating them with commas
if you have a list of numbers, map( str, list ) will convert it to a list of strings