代码中使用装饰器传递session是什么原理？

Question

请懂的佬帮忙解释一下，下图代码中@sessin_required装饰器session传递的原理是什么？

# -*- coding: utf-8 -*-

import random
import requests
from logger_config import logger
from getuseragent import UserAgent
from settings import REQUEST_SETTINGS
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
from functools import wraps

def session_required(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        session = requests.session()
        kwargs['session'] = session
        return func(*args, **kwargs)
    return wrapper


@session_required
def request_with_retry(url, method="GET", params=None, headers=None, proxy=None, session=None):
    if REQUEST_SETTINGS['enable_random_ua']:
        random_ua_list = ["chrome"]
        ua = UserAgent(random.choice(random_ua_list))
        REQUEST_SETTINGS['headers'] = {'user-agent': ua.Random()}

    if REQUEST_SETTINGS['enable_request_proxy']:
        proxy = REQUEST_SETTINGS['proxies']

    # 配置重试策略
    retries = Retry(
        total=REQUEST_SETTINGS['requests_retry_count'],
        backoff_factor=REQUEST_SETTINGS['retry_backoff_factor'],
        status_forcelist=REQUEST_SETTINGS['retry_status_code'])

    session.mount('http://', HTTPAdapter(max_retries=retries))
    session.mount('https://', HTTPAdapter(max_retries=retries))

    try:
        response = session.request(
            method,
            url,
            params=params,
            headers=REQUEST_SETTINGS['headers'],
            proxies=proxy,
            timeout=REQUEST_SETTINGS['request_timeout_second'])
        response.raise_for_status()

        content_type = response.headers.get("Content-Type", "").lower()
        if "application/json" in content_type:
            return response.json()
        else:
            return response.text

    except requests.RequestException as e:
        logger.log('ERROR', f'请求出现异常: {e}')
        return ''

    except requests.RequestException as e:
        logger.log('ERROR', f'请求出现异常: {e}')
        return ''