python爬虫简单小示例

参考文章：https://www.cnblogs.com/dcpeng/p/15335946.html爬虫代码#!python# -*-coding:utf-8-*-from selenium import webdriverfrom selenium.webdriver.common.by import Byfrom selenium.webdriver.support import expec

大预言家

688人浏览 · 2022-03-02 11:39:31

大预言家 · 2022-03-02 11:39:31 发布

参考文章：https://www.cnblogs.com/dcpeng/p/15335946.html

爬虫代码

#!python
# -*-coding:utf-8-*-
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait

class Item:
    page_num = ""
    part = ""
    duration = ""

    def __init__(self, page_num, part, duration):
        self.page_num = page_num
        self.part = part
        self.duration = duration

    def get_second(self):
        str_list = self.duration.split(":")
        sum = 0
        for i, item in enumerate(str_list):
            sum += pow(60, len(str_list) - i - 1) * int(item)
        return sum

def get_bilili_page_items(url):
    options = webdriver.ChromeOptions()
    options.add_argument('--headless')  # 设置无界面
    options.add_experimental_option('excludeSwitches', ['enable-automation'])

    browser = webdriver.Chrome(chrome_options=options)
    print("正在打开网页...")
    browser.get(url)

    print("等待网页响应...")
    # 需要等一下，直到页面加载完成
    wait = WebDriverWait(browser, 10)
    wait.until(EC.visibility_of_element_located((By.XPATH, '//*[@class="list-box"]/li/a')))

    print("正在获取网页数据...")
    list = browser.find_elements_by_xpath('//*[@class="list-box"]/li')
    # print(list)
    itemList = []

    second_sum = 0

    # 2.循环遍历出每一条搜索结果的标题
    for t in list:
        # print("t text:",t.text)
        element = t.find_element_by_tag_name('a')
        # print("a text:",element.text)
        arr = element.text.split('\n')
        print(" ".join(arr))
        item = Item(arr[0], arr[1], arr[2])
        second_sum += item.get_second()
        itemList.append(item)

    print("总数量:", len(itemList))
    print("总时长/分钟:", round(second_sum / 60, 2))
    print("总时长/小时:", round(second_sum / 3600.0, 2))
    browser.close()
    return itemList


get_bilili_page_items("https://www.bilibili.com/video/视频号")

遇到的问题

“C:\Python27\lib\site-packages\selenium\webdriver\chrome\webdriver.py”, line 73, in init
self.service.start()
File “C:\Python27\lib\site-packages\selenium\webdriver\common\service.py”, line 83, in start
os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: ‘chromedriver’ executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

分析：问题的原因是 webdriver版本不对，需要下载正确的 webdriver 版本，并且放置在正确的路径下。