Python:如何转储mechanize.Browser实例的cookie？

pip install mechanize

import mechanize

browser = mechanize.Browser()
browser.open("https://www.example.com")

import cookielib

def dump_cookies(browser):
    cookie_jar = browser._ua_handlers['_cookies'].cookiejar
    cookies = {}
    for cookie in cookie_jar:
        cookies[cookie.name] = cookie.value
    return cookies

cookies = dump_cookies(browser)
print(cookies)

{'cookie_name': 'cookie_value', ...}