How to export sqlite and python exceptions log using Import Error

Question

I am using Python and giving import of sqlite3 library and sqlite3 giving import in Error for exception handling!

import sqlite3
from sqlite3 import Error

def errorlog(erro):
    errlog = open("err_log.txt", 'a')
    errlog.write(erro)
    errlog.close()


def conexaoBanco():
    con = None
    try:
        con = sqlite3.connect('banco.db')
    except Error as er:
        errorlog(er)
    return con

However the variable er does not contain a string! generating this error:

TypeError: write() argument must be str, not OperationalError