利用python批量爬取百度任意类别的图片时：
（1）：设置类别名字。
（2）：设置类别的数目，即每一类别的的图片数量。
（3）：编辑一个txt文件，命名为name.txt，在txt文件中输入类别，此类别即为关键字。并将txt文件与python源代码放在同一个目录下。

python源代码：

# -*- coding: utf-8 -*-
""" Created on Sun Sep 13 21:35:34 2020 @author: ydc """
import re
import requests
from urllib import error
from bs4 import BeautifulSoup
import os

num = 0
numPicture = 0
file = ''
List = []
def Find(url, A):
    global List
    print('正在检测图片总数，请稍等.....')
    t = 0
    i = 1
    s = 0
    while t < 1000:
        Url = url + str(t)
        try:
            # 这里搞了下
            Result = A.get(Url, timeout=7, allow_redirects=False)
        except BaseException:
            t = t + 60
            continue
        else:
            result = Result.text
            pic_url = re.findall('"objURL":"(.*?)",', result, re.S)  # 先利用正则表达式找到图片url
            s += len(pic_url)
            if len(pic_url) == 0:
                break
            else:
                List.append(pic_url)
                t = t + 60
    return s
def recommend(url):
    Re = []
    try:
        html = requests.get(url, allow_redirects=False)
    except error.HTTPError as e:
        return
    else:
        html.encoding = 'utf-8'
        bsObj = BeautifulSoup(html.text, 'html.parser')
        div = bsObj.find('div', id='topRS')
        if div is not None:
            listA = div.findAll('a')
            for i in listA:
                if i is not None:
                    Re.append(i.get_text())
        return Re
def dowmloadPicture(html, keyword):
    global num
    # t =0
    pic_url = re.findall('"objURL":"(.*?)",', html, re.S)  # 先利用正则表达式找到图片url
    print('找到关键词:' + keyword + '的图片，即将开始下载图片...')
    for each in pic_url:
        print('正在下载第' + str(num + 1) + '张图片，图片地址:' + str(each))
        try:
            if each is not None:
                pic = requests.get(each, timeout=7)
            else:
                continue
        except BaseException:
            print('错误，当前图片无法下载')
            continue
        else:
            string = file + r'\\' + keyword + '_' + str(num) + '.jpg'
            fp = open(string, 'wb')
            fp.write(pic.content)
            fp.close()
            num += 1
        if num >= numPicture:
            return
if __name__ == '__main__':  # 主函数入口
    headers = { 
        'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
        'Connection': 'keep-alive',
        'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0',
        'Upgrade-Insecure-Requests': '1'
    }
    A = requests.Session()
    A.headers = headers
    ###############################
    tm = int(input('请输入每类图片的下载数量 '))
    numPicture = tm
    line_list = []
    with open('./name.txt', encoding='utf-8') as file:
        line_list = [k.strip() for k in file.readlines()]  # 用 strip()移除末尾的空格
    for word in line_list:
        url = 'https://image.baidu.com/search/flip?tn=baiduimage&ie=utf-8&word=' + word + '&pn='
        tot = Find(url, A)
        Recommend = recommend(url)  # 记录相关推荐
        print('经过检测%s类图片共有%d张' % (word, tot))
        file = word + '文件'
        y = os.path.exists(file)
        if y == 1:
            print('该文件已存在，请重新输入')
            file = word + '文件夹2'
            os.mkdir(file)
        else:
            os.mkdir(file)
        t = 0
        tmp = url
        while t < numPicture:
            try:
                url = tmp + str(t)
                # result = requests.get(url, timeout=10)
                # 这里搞了下
                result = A.get(url, timeout=10, allow_redirects=False)
                print(url)
            except error.HTTPError as e:
                print('网络错误，请调整网络后重试')
                t = t + 60
            else:
                dowmloadPicture(result.text, word)
                t = t + 60
        # numPicture = numPicture + tm
    print('当前搜索结束，感谢使用')