pymysql. Error get error code and specific error information

#-*-coding:utf-8-*-
import pymysql
import time
import traceback

#  Open database connection 
db = pymysql.connect("127.0.0.1", "root", "123456", "dbname")
#  Use cursor() Method get operation cursor 
cursor = db.cursor(cursor=pymysql.cursors.DictCursor)
try:
    #  perform sql sentence 
    cursor.execute(sql)
    #  Commit to database execution 
    db.commit()
# except:
except pymysql.Error as e:
    print(e.args[0], e.args[1])
    # print(e[0])
    # traceback.print_exc()
    #  Roll back if an error occurs 
#  Close database connection 
db.close()