Python爬网获取全国各地律师电话号

# coding:utf-8
from lxml import etree
import requests,lxml.html,os

class MyError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)
        
def get_lawyers_info(url):
    r = requests.get(url)
    html = lxml.html.fromstring(r.content)
    phones = html.xpath('//span[@class="law-tel"]')
    names = html.xpath('//div[@class="fl"]/p/a')
    if(len(phones) == len(names)):
        list(zip(names,phones))
        phone_infos = [(names[i].text, phones[i].text_content()) for i in range(len(names))]
    else:
        error = "Lawyers amount are not equal to the amount of phone_nums: "+url
        raise MyError(error)
    phone_infos_list = []
    for phone_info in phone_infos:
        if(phone_info[1] == ""):
            #print phone_info[0],u"没留电话"
            info = phone_info[0]+": "+u"没留电话\r\n"
        #print phone_info[0],phone_info[1]
        else:
            info = phone_info[0]+": "+phone_info[1]+"\r\n"
        print info
        phone_infos_list.append(info)
    return phone_infos_list

def get_pages_num(url):
    r = requests.get(url)
    html = lxml.html.fromstring(r.content)
    result = html.xpath('//div[@class="u-page"]/a[last()-1]')
    pages_num = result[0].text
    if pages_num.isdigit():
        return pages_num

def get_all_lawyers(cities):
    dir_path = os.path.abspath(os.path.dirname(__file__))
    print dir_path
    file_path = os.path.join(dir_path,"lawyers_info.txt")
    print file_path
    if os.path.exists(file_path):
        os.remove(file_path)
    #input()
    with open("lawyers_info.txt","ab") as file:
        for city in cities:
            #file.write("City:"+city+"\n")
            #print city
            pages_num = get_pages_num("http://www.64365.com/"+city+"/lawyer/page_1.aspx")
            if pages_num:
                for i in range(int(pages_num)):
                    url = "http://www.64365.com/"+city+"/lawyer/page_"+str(i+1)+".aspx"
                    info = get_lawyers_info(url)
                    for each in info:
                        file.write(each.encode("gbk"))

if __name__ == '__main__':
    cities = ['beijing','shanghai','guangdong','guangzhou','shenzhen','wuhan','hangzhou','ningbo','tianjin','nanjing','jiangsu','zhengzhou','jinan','changsha','shenyang','chengdu','chongqing','xian']
    get_all_lawyers(cities)