如何用python处理xml文件（以更改voc数据集为例）

#!/usr/bin/python
# -*- coding=utf-8 -*-
from xml.etree.ElementTree import ElementTree, Element
def read_xml(in_path):
    '''''读取并解析xml文件
       in_path: xml路径
       return: ElementTree'''
    tree = ElementTree()
    tree.parse(in_path)
    return tree

def write_xml(tree, out_path):
    '''''将xml文件写出
       tree: xml树
       out_path: 写出路径'''
    tree.write(out_path, encoding="utf-8", xml_declaration=True)
# ---------------search -----

def find_nodes(tree, path):
    '''''查找某个路径匹配的所有节点
       tree: xml树
       path: 节点路径'''
    return tree.findall(path)
if __name__ == "__main__":
    # 1. 读取xml文件
    file = open("C:\\Users\\li.yang\\PycharmProjects\\untitled1\\file.txt")

    for lines in file:
        refile = lines.replace('\n', '')  # 替换换行符
        tree=read_xml("C:\\Users\\li.yang\\PycharmProjects\\untitled1\\"+refile)

        #tree = read_xml("C:\\Users\\li.yang\\PycharmProjects\\untitled1\\009962.xml")
        # 4. 删除节点
        # 定位父节点
        nodes = find_nodes(tree, "object/name")
        objects=tree.findall('/object')
        i=0
        if (len(nodes) > 0):
            for objectNum in objects:
                    name = nodes[i].text
                    if(name=="car"):
                        deleteFlag=False
                    elif(name=="person"):
                        deleteFlag=False
                    else:
                        deleteFlag=True
                    if(deleteFlag):
                        del_nodes = tree._root
                        del_nodes.remove(objectNum)
                        i = i + 1
                        # 准确定位子节点并删除之
                    else:
                        i = i + 1
                        continue

        # 6. 输出到结果文件
        write_xml(tree, "C:\\Users\\li.yang\\PycharmProjects\\untitled1\\out\\"+refile)

需要注意的是，路径和缩进对python不熟悉的话很容易出错，使用的时候要认真一点