xml是實現不同語言或程序之間進行數據交換的協議，跟json差不多，但json使用起來更簡單，不過，古時候，在json還沒誕生的黑暗年代，大家只能選擇用xml呀，至今很多傳統公司如金融行業的很多系統的接口還主要是xml。

xml的格式如下，就是通過<>節點來區別數據結構的:

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<?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>

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xml協議在各個語言里的都 是支持的，在python中可以用以下模塊操作xml

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import xml.etree.ElementTree as ET ?? tree = ET.parse("xmltest.xml") root = tree.getroot() print(root.tag) ?? #遍歷xml文檔 for child in root: ????print(child.tag, child.attrib) ????for i in child: ????????print(i.tag,i.text) ?? #只遍歷year 節點 for node in root.iter('year'): ????print(node.tag,node.text)

修改和刪除xml文檔內容

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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") ?? tree.write("xmltest.xml") ?? ?? #刪除node for country in root.findall('country'): ???rank = int(country.find('rank').text) ???if rank > 50: ?????root.remove(country) ?? tree.write('output.xml')

自己創建xml文檔

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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) #生成文檔對象 et.write("test.xml", encoding="utf-8",xml_declaration=True) ?? ET.dump(new_xml) #打印生成的格式

轉載于:https://www.cnblogs.com/weiyiming007/p/8540656.html

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