分析历史天气的趋势。 先采集 代码: #-*- coding:utf-8 -*- import requests import random import MySQLdb import xlwt from bs4 import BeautifulSoup user_agent=['Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.87 Safari/537.36', 'Mozilla/5.0 (X11; U; Linux x86_64; zh-C