标签：swa find col -- 格式 child out 创建 可扩展
xml是实现不同语言或程序之间进行数据交换的协议，可扩展标记语言，标准通用标记语言的子集。是一种用于标记电子文件使其具有结构性的标记语言。
xml格式如下，是通过<>节点来区别数据结构的：
<?xml version="1.0"?> <data> <country name="Liechtenstein"> <rank updated="yes">2</rank> <year>2008</year> <gdppc>141100</gdppc> <neighbor name="Austria" direction="E"/> <neighbor name="Switzerland" direction="W"/> </country> <country name="Singapore"> <rank updated="yes">5</rank> <year>2011</year> <gdppc>59900</gdppc> <neighbor name="Malaysia" direction="N"/> </country> <country name="Panama"> <rank updated="yes">69</rank> <year>2011</year> <gdppc>13600</gdppc> <neighbor name="Costa Rica" direction="W"/> <neighbor name="Colombia" direction="E"/> </country> </data>
xml协议在各个语言里的都 是支持的，在python中可以用以下模块操作xml：
import xml.etree.ElementTree as ET tree = ET.parse("xmltest.xml") root = tree.getroot() print(root.tag) #遍历xml文档 for child in root: print(‘========>‘,child.tag,child.attrib,child.attrib[‘name‘]) for i in child: print(i.tag,i.attrib,i.text) #只遍历year 节点 for node in root.iter(‘year‘): print(node.tag,node.text) #--------------------------------------- import xml.etree.ElementTree as ET tree = ET.parse("xmltest.xml") root = tree.getroot() #修改 for node in root.iter(‘year‘): new_year=int(node.text)+1 node.text=str(new_year) node.set(‘updated‘,‘yes‘) node.set(‘version‘,‘1.0‘) tree.write(‘test.xml‘) #删除node for country in root.findall(‘country‘): rank = int(country.find(‘rank‘).text) if rank > 50: root.remove(country) tree.write(‘output.xml‘) #在country内添加（append）节点year2 import xml.etree.ElementTree as ET tree = ET.parse("a.xml") root=tree.getroot() for country in root.findall(‘country‘): for year in country.findall(‘year‘): if int(year.text) > 2000: year2=ET.Element(‘year2‘) year2.text=‘新年‘ year2.attrib={‘update‘:‘yes‘} country.append(year2) #往country节点下添加子节点 tree.write(‘a.xml.swap‘)
print(root.iter(‘year‘)) #全文搜索 print(root.find(‘country‘)) #在root的子节点找，只找一个 print(root.findall(‘country‘)) #在root的子节点找，找所有
创建xml文档：
import xml.etree.ElementTree as ET new_xml = ET.Element("namelist") name = ET.SubElement(new_xml,"name",attrib={"enrolled":"yes"}) age = ET.SubElement(name,"age",attrib={"checked":"no"}) sex = ET.SubElement(name,"sex") sex.text = ‘33‘ name2 = ET.SubElement(new_xml,"name",attrib={"enrolled":"no"}) age = ET.SubElement(name2,"age") age.text = ‘19‘ et = ET.ElementTree(new_xml) #生成文档对象 et.write("test.xml", encoding="utf-8",xml_declaration=True) ET.dump(new_xml) #打印生成的格式
标签：swa find col -- 格式 child out 创建 可扩展
原文地址：https://www.cnblogs.com/chenchaoze/p/9662874.html
