删除表，如果存在。

import mysql.connector
 
mydb = mysql.connector.connect(
  host="localhost",
  user="myusername",
  passwd="mypassword",
  database="mydatabase"
)
 
mycursor = mydb.cursor()
 
sql = "DROP TABLE IF EXISTS customers"
 
mycursor.execute(sql)
 
#If this page was executed with no error(s), you have successfully deleted the "customers" table.