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2021-11-08爬取优美图库的图片,bs4 解析.
import requests from bs4 import BeautifulSoup import time 解析主页面原代码,提取子页面url通过子页面拿取内容,找到图片的下载地址下载图片 url = 'https://www.umei.cc/bizhitupian/weimeibizhi/' resp = requests.get(url) resp.encoding='utf-8'#处理乱码 #print(CHIL-ORACLE-检查约束（check）
1.检查约束 ( check ) 某列取值范围限制、格式限制等 2.检查只能是男或者女 create table test29( id number primary key, sex varchar2(2) check(sex in ('男,女')) ); create table test30(Leetcode 17. Letter Combinations of a Phone Number(水)
17. Letter Combinations of a Phone Number Medium Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given