Python爬虫实践：获取石家庄空气质量历史数据（13年至今）

from urllib.request import urlopen
from bs4 import BeautifulSoup
import re
import numpy
import csv
import time


def getdatawithtablehead(url):
    """ 该函数用于获取带表头的数据 """
    html = urlopen(url)
    bsobj = BeautifulSoup(html, "lxml", from_encoding="gb18030")  # 获取BeautifulSoup对象

    tablelist = bsobj.findAll("tr")  # 获取所有的表格
    Dataset = []
    tablehead = tablelist[0].get_text().strip("\n").split("\n\n")
    Dataset.append(tablehead)  # 获取表头

    dataset = []
    for datalist in tablelist[1:]:
        data = datalist.get_text().replace(" ", "").replace("\r\n", "").strip("\n").split("\n")
        dataset.append(data)  # 获取当月每一天的数据
    Dataset = numpy.row_stack((Dataset, dataset))
    return Dataset


def getdata(url):
    """ 该函数用于获取不带表头的数据 """
    html = urlopen(url)
    bsobj = BeautifulSoup(html, "lxml", from_encoding="gb18030")
    tablelist = bsobj.findAll("tr")
    dataset = []
    for datalist in tablelist[1:]:
        data = datalist.get_text().replace(" ", "").replace("\r\n", "").strip("\n").split("\n")
        dataset.append(data)
    return dataset

start =time.clock()
# 长沙空气质量指数(AQI)-PM2.5查询地址：
starturl = "http://www.tianqihoubao.com/aqi/shijiazhuang.html"
html = urlopen(starturl)
bsobj = BeautifulSoup(html, "lxml")  # 获取BeautifulSoup对象
# 找到所有存放月度数据的网页链接，并以列表的形式按月份先后顺序保存这些链接
Sites = []
for link in bsobj.findAll(href=re.compile("^(/aqi/shijiazhuang-)")):
    site = "http://www.tianqihoubao.com" + link.attrs['href']
    Sites.append(site)
# 数组反转
Sites.reverse()
print(Sites)
Dataset = getdatawithtablehead(Sites[0])  # 获取表头和第一个月度数据
for url in Sites[1:]:
    dataset = getdata(url)
    Dataset = numpy.row_stack((Dataset, dataset))  # 获取所有月度数据

csvfile = open("shijiazhuang.csv", "w")  # 创建csv文件用于保存数据
try:
    writer = csv.writer(csvfile)
    for i in range(numpy.shape(Dataset)[0]):
        writer.writerow((Dataset[i, :]))  # 将数据逐行写入csv文件
finally:
    csvfile.close()  # 关闭csv文件
    end = time.clock()
    print('Running time: %s Seconds' % (end - start))

原文地址：

https://blog.csdn.net/qq_36185831/article/details/79123144

https://blog.csdn.net/u013337691/article/details/51894453#commentsedit