照着56讲敲代码，为啥报错

CD84380973

哪位大神帮我看看

import urllib.request
import os

def url_open(url):
    req = urllib.requests.Request(url)
    req.add_header('User-Agent','Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36')
    response = urllib.request.urlopen[url]
    html = response.read()

    return html

def get_page(url):
    html = url_open(url).decode(utf-8)

    a = html.find('current-comment-page')+23
    b = html.find(']',a)

    return html[a:b]

def find_img(url):
    html = url_open(url).decode(utf-8)
    img_addrs = []

    a = html.find('img src = ')

    while a != -1:
        b = html.find('.jpg',a,a+255)
        if b != -1:
            img_addrs.append('https:'+html[a+9:b+4])
        else:
            b = a + 9



        a = html.find('img src = ',b)
        
    return img_addrs
   
def save_imgs(folder,img_addrs):
    for each in img_addrs:
        filename = each.split('/')[-1]
        with open(filename,'wb')as f:
            img = url_open(each)
            f.write(img)
   
def download_mm(folder='ooxx',pages=10):
    os.mkdir(folder)
    os.chdir(folder)

    url = 'http://jandan.net/ooxx/'
    page_num = int(get_page[url])

    for i in range(pages):
        page_num -= i
        page_url = url + 'page-' + str(page_num) + '#comments'
        find_addrs = find_imgs(page_url)
        save_imgs(img_addrs)

if __name__ == "__main__":
    download_mm()

CD84380973

有人在吗