如何使用python和appium滚动到视图中未显示的元素

from appium import webdriver
from appium.webdriver.common.touch_action import TouchAction

desired_caps = {
    'platformName': 'Android',
    'platformVersion': '设备的Android版本号',
    'deviceName': '设备名称',
    'appPackage': '应用的包名',
    'appActivity': '应用的启动Activity',
    'noReset': True
}

driver = webdriver.Remote('http://localhost:4723/wd/hub', desired_caps)

parent_element = driver.find_element_by_xpath('父元素的XPath')

parent_location = parent_element.location
parent_size = parent_element.size

start_x = parent_location['x'] + parent_size['width'] / 2
start_y = parent_location['y'] + parent_size['height'] * 0.8
end_x = parent_location['x'] + parent_size['width'] / 2
end_y = parent_location['y'] + parent_size['height'] * 0.2

action = TouchAction(driver)
action.press(x=start_x, y=start_y).move_to(x=end_x, y=end_y).release().perform()