python xml 模塊
阿新 • • 發佈:2018-05-29
行數據 dump 多系統 ech attr col import rec 行業
xml 處理: 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, 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。 文檔格式:他是通過<> 節點來區別數據結構的:
文檔格式
<?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>
#python操作xml協議: import xml.etree.ElementTree as ET 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 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 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
python xml 模塊