Python爬虫练习：爬取高德地图地铁线路及站点数据_中国大城市地铁站点数据爬虫

前言

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作者：Darcy频道

# coding=utf-8
 
import requests
import time
import json
import ast
import os
import utils
from lxml import etree
 
PAGE_URL = 'http://map.amap.com/subway/index.html?&1100'
DATA_URL = 'http://map.amap.com/service/subway?srhdata='
HEADER = {
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"}
 
 
def fetchAllCity(url, header):
    r = requests.get(url, header)
    html = r.content
    element = etree.HTML(html)
    options = element.xpath("//a[contains(@class, 'city')]")
 
    cities = []
    for option in options:
        city = {
            'id': option.get('id'),
            'name': option.get('cityname'),
            'text': option.text
        }
        cities.append(city)
    return cities
 
 
 
def parseCityData(citys):
    lw = open('./lwkt.txt', 'w')
    lw.write('wkt' + '\n')
    pw = open('./pwkt.txt', 'w')
    pw.write('wkt' + '\n')
    for city in citys:
        parseCityPointFromApi(city, lw, pw)
 
 
def parseCityPointFromApi(city, lw, pw):
    url = DATA_URL + "{}_drw_{}.json".format(city['id'], city['name'])
    print(url)
    json_str = requests.get(url).text
    res = json.loads(json_str)
    res = res['l']
    for r in res:
        st = r['st']
        coords = []
        for s in st:
            _coords = s.get('sl', '').split(',')
            coords.append(_coords)
            pwkt = '"POINT ({} {})"'.format(_coords[0], _coords[1])
            pw.write(pwkt + '\n')
        new_coords = ','.join(['%s %s' % (coord[0], coord[1]) for coord in coords])
        lwkt = '"LINESTRING(%s)"' % new_coords
        lw.write(lwkt + '\n')
 
 
 
def main():
    cities = fetchAllCity(PAGE_URL, HEADER)
    print(cities)
    parseCityData(cities)
 
 
 
if __name__ == '__main__':
    main()

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