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      python

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      selenium教程

      强制等待、显式等待、隐式等待代码示例

      2020-07-28 196赞 python中国网
      每篇文章努力于解决一个问题!python高级、python面试全套、操作系统经典课等可移步文章底部。

        场景

        1.打开百度,等待输入框元素和搜搜按钮出现(输入框和搜索按钮出现才说明网页加载好了)

        2.输入www.pythjon66.com,点击搜索

        3.在搜索结果页等待下一页这个元素出现(出现下一页的话,说明网页加载到了底部,页面的数据比较全了)

        一:强制等待

      	# -*- coding: utf-8 -*-
      
      import time
      from selenium import webdriver
      from selenium.webdriver.common.by import By
      from selenium.webdriver.support.ui import WebDriverWait
      from selenium.webdriver.support import expected_conditions as EC
      from selenium.webdriver.chrome.options import Options
      
      
      def get_html(kwd, retry=2):
          try:
              driver.get('https://www.baidu.com/')
              # 强制等待5秒尽量确保页面加载好
              time.sleep(5)
              # 输入框
              input = driver.find_element_by_id('kw')
              input.click()  # 先click后clear,直接send_keys容易丢失字符
              input.clear()
              # 输入文字
              for wd in kwd:
                  input.send_keys(wd)
              # 搜索按钮
              baidu = driver.find_element_by_id('su')
              # 点击搜索
              baidu.click()
              # 强制等待5秒尽量让搜索结果页加载完
              time.sleep(5)
          except Exception as e:
              print(e)
              time.sleep(10)
              if retry > 0:
                  get_html(kwd, retry - 1)
          else:
              title = driver.title
          return title
      
      
      if __name__ == "__main__":
      
          pc_ua = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36'
          option = Options()
          prefs = {
              'profile.default_content_setting_values': {
                  'images' : 2, # 禁止图片加载
                  'notifications': 2  # 禁止弹窗
              }
          }
          option.add_experimental_option('prefs', prefs)
          driver = webdriver.Chrome(options=option)
          title = get_html('www.bdd33.com')
          print(title)
          driver.quit()
      

        二:显式等待

      # -*- coding: utf-8 -*-
      
      import time
      from selenium import webdriver
      from selenium.webdriver.common.by import By
      from selenium.webdriver.support.ui import WebDriverWait
      from selenium.webdriver.support import expected_conditions as EC
      from selenium.webdriver.chrome.options import Options
      
      
      def get_html(kwd, retry=2):
          try:
              driver.get('https://www.baidu.com/')
              # 输入框元素,显式等待设定最多5秒
              input = WebDriverWait(driver, 5).until(
                  EC.visibility_of_element_located((By.ID, "kw"))
              )
              input.click()  # 先click后clear,直接send_keys容易丢失字符
              input.clear()
              # 输入文字
              for wd in kwd:
                  input.send_keys(wd)
              # 搜索按钮元素,显式等待设定最多5秒
              baidu = WebDriverWait(driver, 5).until(
                  EC.visibility_of_element_located((By.ID, "su"))
              )
              # 点击搜索
              baidu.click()
              # 下一页,显式等待设定最多5秒(有的词没有相关搜索可能报错)
              xg_serach = WebDriverWait(driver, 15).until(
                  EC.visibility_of_element_located((By.CLASS_NAME, "tt"))
              )
          except Exception as e:
              print(e)
              time.sleep(10)
              if retry > 0:
                  get_html(kwd, retry - 1)
          else:
              title = driver.title
          return title
      
      
      if __name__ == "__main__":
      
          pc_ua = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36'
          option = Options()
          prefs = {
              'profile.default_content_setting_values': {
                  'images' : 2, # 禁止图片加载
                  'notifications': 2  # 禁止弹窗
              }
          }
          option.add_experimental_option('prefs', prefs)
          driver = webdriver.Chrome(options=option)
          title = get_html('www.bdd33.com')
          print(title)
          driver.quit()
      

        三、隐式等待

      # -*- coding: utf-8 -*-
      
      
      import time
      from selenium import webdriver
      from selenium.webdriver.chrome.options import Options
      
      
      def get_html(kwd, retry=2):
          try:
              driver.get('https://www.baidu.com/')
              # 输入框
              input = driver.find_element_by_id('kw')
              input.click()  # 先click后clear,直接send_keys容易丢失字符
              input.clear()
              # 输入文字
              for wd in kwd:
                  input.send_keys(wd)
              print(driver.window_handles,driver.current_url)
              # 搜索按钮
              baidu = driver.find_element_by_id('su')
              # 点击搜索
              baidu.click()
              # 底部文本 此处也会隐式等待
              element = driver.find_element_by_id('help')
          except Exception as e:
              print(e)
              time.sleep(10)
              if retry > 0:
                  get_html(kwd, retry - 1)
          else:
              print(driver.window_handles,driver.current_url)
              title = driver.title
          return title
      
      
      if __name__ == "__main__":
      
          pc_ua ='Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36'
          option = Options()
          prefs = {
             'profile.default_content_setting_values': {
                 'images' : 2, # 禁止图片加载
                 'notifications': 2  # 禁止弹窗
              }
          }
          option.add_experimental_option('prefs', prefs)
          driver = webdriver.Chrome(options=option)
          # 隐式等待设置5秒
          driver.implicitly_wait(30)
          title = get_html('python')
          print(title)
      
      
      if __name__ == "__main__":
      
          pc_ua = 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36'
          option = Options()
          prefs = {
              'profile.default_content_setting_values': {
                  'images' : 2, # 禁止图片加载
                  'notifications': 2  # 禁止弹窗
              }
          }
          option.add_experimental_option('prefs', prefs)
          driver = webdriver.Chrome(options=option)
          # 隐式等待设置5秒
          driver.implicitly_wait(5)
          title = get_html('www.bdd33.com')
          print(title)
          # driver.quit() #如果设置了driver.quit()会很快退出,网页的title还是百度首页的title
      
      
      ['CDwindow-0C09496C4890920231EFAB157730936A'] https://www.baidu.com/
      ['CDwindow-0C09496C4890920231EFAB157730936A'] https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=baidu&wd=python&rsv_t=8a68lZY5YfYYb3CvaeMfYM9TJANA52kQOO484WvXZOLSo7BSB5x0t1xvfgE&rsv_enter=0&rsv_dl=tb&rsv_sug3=7&rsv_sug1=1&rsv_sug7=100&inputT=270&rsv_sug4=325
      python_百度搜索
      
      
      

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