# !/usr/bin/env python# -*- coding:utf-8 -*-  """圖片(文件)下載,核心方法是 urllib.urlrequest 模塊的 urlretrieve()方法 urlretrieve(url, filename=None, reporthook=None, data=None) url: 文件url filename: 保存到本地時,使用的文件(路徑)名稱 reporthook: 文件傳輸時的回調函數 data: post提交到服務器的數據 該方法返回一個二元元組("本地文件路徑",<http.client.HTTPMessage對象>)""" import requestsimport urllib.requestfrom lxml import etree  def crawl(): url='http://www.ivsky.com/tupian/haiyangshijie/' headers={ "User-Agent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.108 Safari/537.36", }  resp=requests.get(url,headers=headers)  if resp.status_code==200: resp.encoding='UTF-8' html=etree.HTML(resp.text)  img_titles=html.xpath('//ul[@class="ali"]//a/@title') img_urls=html.xpath('//ul[@class="ali"]//a/img/@src')  data=zip(img_titles,img_urls) for img_title,img_url in data:  print('開始下載{title}.jpg'.format(title=img_title))  result=urllib.request.urlretrieve(img_url,     filename='../../data/圖片下載爬蟲/{title}.jpg'.format(title=img_title),     reporthook=loading,     data=None)  # print(result) def loading(blocknum,blocksize,totalsize): """ 回調函數: 數據傳輸時自動調用 blocknum:已經傳輸的數據塊數目 blocksize:每個數據塊字節 totalsize:總字節 """ percent=int(100*blocknum*blocksize/totalsize) if percent>100: percent=100 print("正在下載>>>{}%".format(percent)) import time time.sleep(0.5)  if __name__ == '__main__': crawl()