1. PEXELS网站提供海量共享图片素材，图片质量高，可免费用于个人和商业用途。
   网址：https://www.pexels.com/

2. 网站支持英文关键字，可考虑用有道智云API将中文转变成英文。

3. 采用requests 写入方法爬取图片。

代码如下()：

# 网页采用了动态加载，目前一次只抓取15张左右的图片。
import requests
import hashlib
import random
import json
from bs4 import BeautifulSoup

def translate(q):
    appKey = 'XXXXX'       #应用ID，进行注册后可自动获得
    secretKey = 'XXXXX'   #应用密钥，进行注册后可自动获得 
    url = 'http://openapi.youdao.com/api'
    fromLang = 'zh-CHS';toLang = 'EN';salt = random.randint(1, 10)     #中译英

    sign1 = appKey+q+str(salt)+secretKey
    sign = hashlib.md5(sign1.encode(encoding='utf-8')).hexdigest()
    myurl = url+'?q='+q+'&from='+fromLang+'&to='+toLang+'&salt='+str(salt)\
            +'&appKey='+appKey+'&sign='+sign
     
    r = requests.get(myurl)
    json_data = json.loads(r.text)
    result = json_data['web'][0]['value'][0]
    return result

def get_image(url):
    headers = {'user-agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3294.6 Safari/537.36'}
    r = requests.get(url,headers = headers)
    print(r.status_code)
    soup = BeautifulSoup(r.text,"lxml")

    infos = soup.select("img.photo-item__img")
    download_list = []
    for info in infos:
        image_url = info.get('src')
        download_list.append(image_url)
    for item in download_list:
        res = requests.get(item,headers = headers)
        file_name = item.split("?")[0][-10:].strip("-")
        with open("F://"+file_name,'wb') as f:
            f.write(res.content)
        print(file_name)
    

if __name__ == "__main__":        
    word = input("请输入您要搜索的中文关键词:")
    result = translate(word)
    print(result)

    url = "https://www.pexels.com/search/" + result
    get_image(url)
    print("Finished!")