import MySQLdb
znachenie = "12345"
MyDB=MySQLdb.connect(host='localhost', user='mydb', passwd='pass', db='mydb', charset='utf8')
cursor = MyDB.cursor()
cursor.execute(""" INSERT INTO mydb(mydb) VALUES (%s)""", (znachenie))
MyDB.commit()
MyDB.close()

 SHOW COLUMNS FROM [mydb];
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[mydb]' at line 1
mysql> SELECT * FROM [mydb];
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[mydb]' at line 1

 (znachenie,)