我正在自动执行我的whatsapp发送消息，我要发送，但是如果该联系人不可见（如果它在我的联系人列表的底部），则硒找不到用户。所以我想做类似的事情，如果用户找不到，则向下滚动直到找到用户。

我尝试使用send_Keys（KEY.PAGE_DOWN）函数，但随后无法正常工作，它只能向下滚动一点，直到我希望滚动到该特定用户为止。

try:
        name = ["wenxuan","凯文","lzs real","GG Exhibition（DEM & DIT）","seaboom"]

        for names in name:  # loop across the list of user name
            user = driver.find_element_by_xpath('//span[@title = "{}"]'.format(names))  # locate the user
            user.click()  # click in to that user
except:
        #exception occur when the user is not visible
        print("User not found im scrolling down")
        groupName = driver.find_elements_by_css_selector("span._19RFN._1ovWX")
        gName = [message.text for message in groupName]  # get the user name
        print(gName[-1])
        if gName[-1] == "GG": # if the name of the user is GG mean the bottom of contact list
            for z in range(99):
                driver.find_element_by_tag_name('body').send_keys(
                    Keys.PAGE_UP) # scroll up

        else:

            driver.find_element_by_tag_name('body').send_keys(
                        Keys.PAGE_DOWN) # if user not found scroll down

我想要的输出是我可以滚动到该特定用户，然后在找不到该用户的情况下单击