老师，为什么我的上滑操作没有生效？也没报错，您之前视频中也有这个问题，最后怎么解决的？

# coding:utf-8
from appium import webdriver
import time
def get_driver():
   capabilities = {
       "platformName": "Android",        #设备系统
       "deviceName": "127.0.0.1:21503",  #adb devices 命令下的设备编号
       "app": "C:\\mukewang.apk",   #apk地址
       "appActivity": "cn.com.open.mooc.index.splash.GuideActivity"  #程序入口，1.7版本以上的Appium可以不维护该参数，如果系统找不到可以维护
   }
   driver = webdriver.Remote("http://127.0.0.1:4723/wd/hub",capabilities)
   return driver

#获取屏幕的宽和高
def get_size():
   size = driver.get_window_size()
   width = size["width"]
   height = size["height"]
   return width,height

#向左边滑动
def swipe_left():
   x1 = get_size()[0]/10*9
   y1 = get_size()[1]/2
   x = get_size()[0]/10
   driver.swipe(x1,y1,x,y1,2000)

#向右边滑动
def swipe_right():
   x1 = get_size()[0]/10
   y1 = get_size()[1]/2
   x = get_size()[0]/10*9
   driver.swipe(x1,y1,x,y1,2000)

#向上滑动
def swipe_up():
   x1 = get_size()[0]/2
   y1 = get_size()[1]/10*9
   y = get_size()[1]/10
   driver.swipe(x1,y1,x1,y,2000)

#向下滑动
def swipe_down():
   x1 = get_size()[0]/2
   y1 = get_size()[1]/10
   x = get_size()[0]/10*9
   driver.swipe(x1,y1,x1,y,2000)

def swipe_on(direction):
   if direction == "up":
       swipe_up()
   elif direction == "down":
       swipe_down()
   elif direction == "left":
       swipe_left()
   else:
       swipe_right()

driver = get_driver()
swipe_on("left")
swipe_on("left")
swipe_on("right")
swipe_on("left")
swipe_on("up")
time.sleep(10)