Python学习笔记之抓取某只基金历史净值数据实战案例

# coding: utf-8
from selenium.webdriver.support.ui import WebDriverWait
from selenium import webdriver
from bs4 import BeautifulSoup
from threading import Thread,Lock
import os
import csv
# 下面是利用 selenium 抓取html页面的代码
# 初始化函数
def initSpider():
  driver = webdriver.PhantomJS(executable_path=r"你phantomjs可执行文件的绝对路径")
  driver.get("http://fund.eastmoney.com/f10/jjjz_519961.html") # 要抓取的网页地址
  # 找到"下一页"按钮,就可以得到它前面的一个label,就是总页数
  getPage_text = driver.find_element_by_id("pagebar").find_element_by_xpath(
    "div[@class='pagebtns']/label[text()='下一页']/preceding-sibling::label[1]").get_attribute("innerHTML")
  # 得到总共有多少页
  total_page = int("".join(filter(str.isdigit, getPage_text)))
  # 返回
  return (driver,total_page)
# 获取html内容
def getData(myrange,driver,lock):
  for x in myrange:
    # 锁住
    lock.acquire()
    tonum = driver.find_element_by_id("pagebar").find_element_by_xpath(
      "div[@class='pagebtns']/input[@class='pnum']") # 得到 页码文本框
    jumpbtn = driver.find_element_by_id("pagebar").find_element_by_xpath(
      "div[@class='pagebtns']/input[@class='pgo']") # 跳转到按钮
    tonum.clear() # 第x页 输入框
    tonum.send_keys(str(x)) # 去第x页
    jumpbtn.click() # 点击按钮
    # 抓取
    WebDriverWait(driver, 20).until(lambda driver: driver.find_element_by_id("pagebar").find_element_by_xpath("div[@class='pagebtns']/label[@value={0} and @class='cur']".format(x)) != None)
    # 保存到项目中
    with open("../htmls/details/{0}.txt".format(x), 'wb') as f:
      f.write(driver.find_element_by_id("jztable").get_attribute("innerHTML").encode('utf-8'))
      f.close()
    # 解锁
    lock.release()
# 开始抓取函数
def beginSpider():
  # 初始化爬虫
  (driver, total_page) = initSpider()
  # 创建锁
  lock = Lock()
  r = range(1, int(total_page)+1)
  step = 10
  range_list = [r[x:x + step] for x in range(0, len(r), step)]  #把页码分段
  thread_list = []
  for r in range_list:
    t = Thread(target=getData, args=(r,driver,lock))
    thread_list.append(t)
    t.start()
  for t in thread_list:
    t.join() # 这一步是需要的,等待线程全部执行完成
  print("抓取完成")
# #################上面代码就完成了 抓取远程网站html内容并保存到项目中的 过程

beginSpider()