关于python etree文件操作的一个问题

Question

#coding=utf-8 import tempfile import os import re import time import xml.etree.cElementTree as ETdef uidump():os.popen("adb shell uiautomator dump /data/local/tmp/uidump.xml")os.popen("adb pull /data/local/tmp/uidump.xml D:/ ")def element(attrib, name):"""同属性单个元素，返回单个坐标元组"""uidump()with open("uidump.xml",'r+', encoding="utf-8" ,errors='ignore') as xml_file:tree = ET.parse(xml_file)treeIter = tree.iter(tag="node")for elem in treeIter:if elem.attrib[attrib] == name:bounds = elem.attrib["bounds"]coord = re.compile(r"\d+").findall(bounds)Xpoint = (int(coord[2]) - int(coord[0])) / 2.0 + int(coord[0])Ypoint = (int(coord[3]) - int(coord[1])) / 2.0 + int(coord[1])return Xpoint, Ypointuidump()e1=element("text","公众号")我写了一个代码， 从python调用adb连接安卓手机，通过一个名为uidump.xml的文件解析当前界面的信息，但是执行后一直提示FileNotFoundError: [Errno 2] No such file or directory: 'uidump.xml'，即解析之前不会先拉取文件，而是先解析然后报错之后会正常拉取文件，这是什么原因呢？谢谢！