抓取天气的小脚本

fetch_weather.rb

#!/usr/bin/env ruby
#encoding:utf-8 

require 'csv'
require 'open-uri'
require 'nokogiri'
require 'date'

def generate_url(date)
  "http://history.tianqizx.cn/his_1582_" + date.strftime('%Y/%-m/%-d') + ".aspx"
end

start_date = Date.new(2013, 4, 28)
end_date = Date.new(2013,5, 31)
day_num = end_date - start_date 

CSV.open("file1.csv", 'wb') do |csv|
	day_num.to_i.times do |i|
		weather_url = generate_url(start_date + i)
		doc = Nokogiri::HTML(open(weather_url))
		contents =  doc.css('#tr_1>td:first').inner_html().split('<br>')
		csv << contents.push(start_date + i)
	end
end

puts "OK"