


This article mainly introduces python to use lxml to read and write files in xml format. It has certain reference value. Interested friends can refer to
before converting the data set format. Sometimes you need to convert json to xml file, and it is very convenient to use the lxml package.
1. Write xml file
a) Test.xml output using etree and objectify
##
from lxml import etree, objectify E = objectify.ElementMaker(annotate=False) anno_tree = E.annotation( E.folder('VOC2014_instance'), E.filename("test.jpg"), E.source( E.database('COCO'), E.annotation('COCO'), E.image('COCO'), E.url("http://test.jpg") ), E.size( E.width(800), E.height(600), E.depth(3) ), E.segmented(0), ) etree.ElementTree(anno_tree).write("text.xml", pretty_print=True)The content of the file is as follows: "If you need to add other tags on the basis of anno_tree, just use append:
E2 = objectify.ElementMaker(annotate=False) anno_tree2 = E2.object( E.name("person"), E.bndbox( E.xmin(100), E.ymin(200), E.xmax(300), E.ymax(400) ), E.difficult(0) ) anno_tree.append(anno_tree2)Above The output becomes:
<annotation> <folder>VOC2014_instance/person</folder> <filename>test.jpg</filename> <source> <database>COCO</database> <annotation>COCO</annotation> <image>COCO</image> <url>http://test.jpg</url> </source> <size> <width>800</width> <height>600</height> <depth>3</depth> </size> <segmented>0</segmented> <object> <name>person</name> <bndbox> <xmin>100</xmin> <ymin>200</ymin> <xmax>300</xmax> <ymax>400</ymax> </bndbox> <difficult>0</difficult> </object> </annotation>b) Use etree and SubElement
##
annotation = etree.Element("annotation") etree.SubElement(annotation, "folder").text = "VOC2014_instance" etree.SubElement(annotation, "filename").text = "test.jpg" source = etree.SubElement(annotation, "source") etree.SubElement(source, "database").text = "COCO" etree.SubElement(source, "annotation").text = "COCO" etree.SubElement(source, "image").text = "COCO" etree.SubElement(source, "url").text = "http://test.jpg" size = etree.SubElement(annotation, "size") etree.SubElement(size, "width").text ='800' # 必须用string etree.SubElement(size, "height").text = '600' etree.SubElement(size, "depth").text = '3' etree.SubElement(annotation, "segmented").text = '0' key_object = etree.SubElement(annotation, "object") etree.SubElement(key_object, "name").text = “person” bndbox = etree.SubElement(key_object, "bndbox") etree.SubElement(bndbox, "xmin").text = str(100) etree.SubElement(bndbox, "ymin").text = str(200) etree.SubElement(bndbox, "xmax").text = str(300) etree.SubElement(bndbox, "ymax").text = str(400) etree.SubElement(key_object, "difficult").text = '0' doc = etree.ElementTree(annotation) doc.write(open("test.xml", "w"), pretty_print=True)
2. Read xml
Here you can use xpath to directly extract the value of the required element. For example, if you want to get the x, y coordinates of the test.xml file above:
##. #tree = etree.parse("test.xml") # get bbox for bbox in tree.xpath('//bndbox'): # 获取bndbox元素的内容 for corner in bbox.getchildren(): # 便利bndbox元素下的子元素 print corner.text # string类型
The above is the detailed content of Example sharing of how Python uses lxml to read and write xml format files. For more information, please follow other related articles on the PHP Chinese website!

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于Seaborn的相关问题,包括了数据可视化处理的散点图、折线图、条形图等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于进程池与进程锁的相关问题,包括进程池的创建模块,进程池函数等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于简历筛选的相关问题,包括了定义 ReadDoc 类用以读取 word 文件以及定义 search_word 函数用以筛选的相关内容,下面一起来看一下,希望对大家有帮助。

VS Code的确是一款非常热门、有强大用户基础的一款开发工具。本文给大家介绍一下10款高效、好用的插件,能够让原本单薄的VS Code如虎添翼,开发效率顿时提升到一个新的阶段。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于数据类型之字符串、数字的相关问题,下面一起来看一下,希望对大家有帮助。

pythn的中文意思是巨蟒、蟒蛇。1989年圣诞节期间,Guido van Rossum在家闲的没事干,为了跟朋友庆祝圣诞节,决定发明一种全新的脚本语言。他很喜欢一个肥皂剧叫Monty Python,所以便把这门语言叫做python。

本篇文章给大家带来了关于Python的相关知识,其中主要介绍了关于numpy模块的相关问题,Numpy是Numerical Python extensions的缩写,字面意思是Python数值计算扩展,下面一起来看一下,希望对大家有帮助。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver Mac version
Visual web development tools

Notepad++7.3.1
Easy-to-use and free code editor

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
