Python之xml學習筆記
阿新 • • 發佈:2019-04-25
金融行業 數據交換 所有 mov text dir 文件 金融 utf
xml處理模塊
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,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:
<?xml version="1.0"?> <data> <country name="Liechtenstein"> <rank updated="yes">2</rank> <year updated_by="yunfei">2009</year> <gdppc>141100</gdppc> <neighbor direction="E" name="Austria" /> <neighbor direction="W" name="Switzerland" /> <info> <population>90</population> <size>960</size> </info> </country> <country name="Singapore"> <rank updated="yes">5</rank> <year updated_by="yunfei">2012</year> <gdppc>59900</gdppc> <neighbor direction="N" name="Malaysia" /> </country> <country name="Panama"> <rank updated="yes">69</rank> <year updated_by="yunfei">2012</year> <gdppc>13600</gdppc> <neighbor direction="W" name="Costa Rica" /> <neighbor direction="E" name="Colombia" /> </country> </data>
xml協議在各個語言裏的都 是支持的,在python中可以用以下模塊操作xml :
import xml.etree.ElementTree as ET #引用方法,重命名為ET tree = ET.parse("xmltest.xml") root = tree.getroot() #print(root) print(root.tag)#tag就是標簽名<data> # 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:
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#轉為int型後加1 node.text = str(new_year) node.set("updated_by", "yunfei")#加一個屬性 tree.write("xmltest.xml") # 刪除node for country in root.findall(‘country‘):#找出所有的country,循環country rank = int(country.find(‘rank‘).text)#找出country下的rank的text if rank > 50: root.remove(country)#移除此country tree.write(‘output.xml‘)#結果放在output.xml裏
創建xml文件:
import xml.etree.ElementTree as ET new_xml = ET.Element("personinfolist") personinfo = ET.SubElement(new_xml, "personinfo", attrib={"enrolled": "yes"}) name = ET.SubElement(personinfo, "name") age = ET.SubElement(personinfo, "age", attrib={"checked": "no"}) sex = ET.SubElement(personinfo, "sex") name.text=‘yunfei‘ age.text = ‘24‘ sex.text=‘男‘ personinfo2 = ET.SubElement(new_xml, "personinfo2", attrib={"enrolled": "no"}) name = ET.SubElement(personinfo2, "name") age = ET.SubElement(personinfo2, "age") name.text=‘yuxia‘ age.text = ‘19‘ sex.text=‘女‘ 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
註:這是一篇學習筆記,大家多多指教。
Python之xml學習筆記