try:
    #可能会出现异常代码
except ErrorType1:
    #处理 ErroType1 类型异常
except ErrorType2:
    #处理 ErroType2 类型异常
else:
    #如果没有异常，执行的代码
finally:
    #不管是否有异常，都执行的代码。

def request_post(url, sql, user, pwd):
    data = []
    sql = sql.encode("utf-8")
    headers = {
            'Connection': 'keep-alive',
            'Accept-Encoding': 'gzip, deflate, br'
        }
    try:
        result = requests.post(url, data=sql, auth=HTTPBasicAuth(user,pwd),headers=headers)
    except OSError as e:
        print(e)
        print(f"Cannot connect to {url}")
    else:
        text=result.content.decode()
        data = json.loads(text)
        if len(data) < 1:
            print("Response message Error!")
            return data
        else:
            return data