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selenium显示和隐式等待


0 前言

当采用Ajax技术时,动态加载的元素并不是立即出现的,会受网速或其他因素的影响。此时如果使用selenium来操作,有可能就会获取不到该元素而报错,为了防止这种情况,selenium提供了两种等待方式:

隐式等待:等待指定时间后再获取该元素。如果还获取不到就报错。
显示等待:在指定时间内,如果元素出现则去继续操作,如果超时就报异常。(较常用)

1. 隐式等待

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

driver_path = r'D:\driver\geckodriver_win64.exe'
driver = webdriver.Firefox(executable_path=driver_path)

# 隐式等待
driver.get('https://www.baidu.com/')
driver.implicitly_wait(10)
driver.find_element_by_id('dsad')

2. 显示等待

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

driver_path = r'D:\driver\geckodriver_win64.exe'
driver = webdriver.Firefox(executable_path=driver_path)

# 显式等待
driver.get('https://www.baidu.com/')
try:
    element = WebDriverWait(driver,10).until(
        # 获取id=su的元素
        EC.presence_of_element_located((By.ID,'su'))  # 传入一个元祖
    )
finally:
    driver.quit()


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