按照书本内容输入代码报错

requests_html HTMLSessionUserAgent
session = HTMLSession()
ua = UserAgent().random
r = session.get(={:ua})
r.encoding = r.status_code == :
    r.html.render()
    class_wp = r.html.xpath()
    a  class_wp:
        title = a.find()[].text
        rate = a.find()[].text
        details_url = a.attrs.get()
        img_url = a.find()[].attrs.get()
        (title)
        (rate)
        (details_url)
        (img_url)