python 爬虫 循环分页

import os
from time import sleep

import faker
import requests
from lxml import etree

fake = faker.Faker()

base_url = "http://angelimg.spbeen.com"

def get_next_link(url):
    content = downloadHtml(url)
    html = etree.HTML(content)
    next_url = html.xpath("//a[@class='ch next']/@href")
    if next_url:
        return base_url + next_url[0]
    else:
        return False

def downloadHtml(ur):
    user_agent = fake.user_agent()
    headers = {'User-Agent': user_agent,"Referer":"http://angelimg.spbeen.com/"}
    response = requests.get(url, headers=headers,timeout=20)
    if response.status_code != 200:
        return None
    else:
        return response.text

def getImgUrl(content):
    html  = etree.HTML(content)
    img_url = html.xpath('//*[@ + url)
                i = i + 1
            except Exception as e:
                print(str(e))
    except Exception as e:
        print(str(e))

结果