原文地址： Python 3 多线程下载百度图片搜索结果

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Author: loveNight

import json
import itertools
import urllib
import requests
import os
import re
import sys


str_table = {
'_z2C$q': ':',
'_z&e3B': '.',
'AzdH3F': '/'
}

char_table = {
'w': 'a',
'k': 'b',
'v': 'c',
'1': 'd',
'j': 'e',
'u': 'f',
'2': 'g',
'i': 'h',
't': 'i',
'3': 'j',
'h': 'k',
's': 'l',
'4': 'm',
'g': 'n',
'5': 'o',
'r': 'p',
'q': 'q',
'6': 'r',
'f': 's',
'p': 't',
'7': 'u',
'e': 'v',
'o': 'w',
'8': '1',
'd': '2',
'n': '3',
'9': '4',
'c': '5',
'm': '6',
'0': '7',
'b': '8',
'l': '9',
'a': '0'
}

# str 的translate方法需要用单个字符的十进制unicode编码作为key
# value 中的数字会被当成十进制unicode编码转换成字符
# 也可以直接用字符串作为value
char_table = {ord(key): ord(value) for key, value in char_table.items()}

# 解码图片URL
def decode(url):
    # 先替换字符串
    for key, value in str_table.items():
        url = url.replace(key, value)
    # 再替换剩下的字符
    return url.translate(char_table)

# 生成网址列表
def buildUrls(word):
    word = urllib.parse.quote(word)
    url = r"http://image.baidu.com/search/acjson?tn=resultjson_com&ipn=rj&ct=201326592&fp=result&queryWord={word}&cl=2&lm=-1&ie=utf-8&oe=utf-8&st=-1&ic=0&word={word}&face=0&istype=2nc=1&pn={pn}&rn=60"
    urls = (url.format(word=word, pn=x) for x in itertools.count(start=0, step=60))
    return urls

# 解析JSON获取图片URL
re_url = re.compile(r'"objURL":"(.*?)"')

def resolveImgUrl(html):
    imgUrls = [decode(x) for x in re_url.findall(html)]
    return imgUrls

def downImg(imgUrl, dirpath, imgName):
    filename = os.path.join(dirpath, imgName)
    try:
        res = requests.get(imgUrl, timeout=15)
        if str(res.status_code)[0] == "4":
           print(str(res.status_code), ":" , imgUrl)
           return False
    except Exception as e:
           print("抛出异常：", imgUrl)
           print(e)
           return False
    with open(filename, "wb") as f:
         f.write(res.content)
    return True


def mkDir(dirName):
    dirpath = os.path.join(sys.path[0], dirName)
    if not os.path.exists(dirpath):
           os.mkdir(dirpath)
    return dirpath

if __name__ == '__main__':
   print("欢迎使用百度图片下载脚本！\n目前仅支持单个关键词。")
   print("下载结果保存在脚本目录下的results文件夹中。")
   print("=" * 50)
   word = input("请输入你要下载的图片关键词：\n")

   dirpath = mkDir("results")

   urls = buildUrls(word)
   index = 0
   for url in urls:
       print("正在请求：", url)
       html = requests.get(url, timeout=10).content.decode('utf-8')
       imgUrls = resolveImgUrl(html)
       if len(imgUrls) == 0: # 没有图片则结束
          break
       for url in imgUrls:
           if downImg(url, dirpath, str(index) + ".jpg"):
              index += 1
              print("已下载 %s 张" % index)