selenium--判断元素是否存在

# coding:utf-8
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
 
driver=webdriver.Firefox()
class Find_Element():
    def __inti__(self,driver):
        self.driver=driver
    def is_exist(self,locator,timeout=30,frequency=0.5):
        """
        locator 参数是定位方式，如("id", "kw"),把两个参数合并为一个
        *号是把两个参数分开传值
         使用方法：
        locator = ("id", "kw")
        driver.find_element(*locator)
        :param locator:
        :param timeout:
        :param frequency:
        :return:
        """
        try:
            element=WebDriverWait(driver,timeout,frequency).until(lambda driver:driver.find_element(*locator))
            return element
 
        except:
            return False
 
    def is_exist2(self,by,value,timeout=30,frequency=0.5):
        """
        locator 参数是定位方式，如("id", "kw"),把两个参数合并为一个
        *号是把两个参数分开传值
         使用方法：
        locator = ("id", "kw")
        driver.find_element(*locator)
        :param locator:
        :param timeout:
        :param frequency:
        :return:
        """
        try:
            element=WebDriverWait(driver,timeout,frequency).until(lambda driver:driver.find_element(by,value))
            return element
 
        except:
            return False
 
    def is_text_in_element(self,locator,text，timeout=30,frequency=0.5):
        """
        locator 参数是定位方式，如("id", "kw"),把两个参数合并为一个
        *号是把两个参数分开传值
         使用方法：
        locator = ("id", "kw")
        driver.find_element(*locator)
        :param locator:
        :param timeout:
        :param frequency:
        :return:
        """
        try:
            element=WebDriverWait(driver,timeout,frequency).until(EC.text_to_be_present_in_element(locator，text))
            return True
 
        except:
            return False
 
    def send_keys(self,text,locate):
        self.driver.find_element(*locate).send_keys(text)
 
if __name__=="__main__":
    driver=webdriver.Firefox()
    driver.get("https://www.baidu.com")
    base_driver=Find_Element(driver) #实例化
    input_loc=("id","kw")
    base_driver.send_keys(input_loc,"致橡树的你")
    driver.quit()

from selenium.webdriver.common.by import By

driver.find_element("id", "kw")
driver.find_element("xpath", "xxx")
driver.find_element("link text", "xxx")
driver.find_element("partial link text", "xxx")
driver.find_element("name", "xxx")
driver.find_element("tag name", "xxx")
driver.find_element("class name", "xxx")
driver.find_element("css selector", "xxx")