Python基礎知識之xml模塊
阿新 • • 發佈:2017-12-23
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轉載自:http://www.cnblogs.com/alex3714/articles/5161349.html
XML處理模塊:
ml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:
<?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:
遍歷xml文檔
import xml.etree.ElementTree as ET
tree = ET.parse("test.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文檔的內容
import xml.etree.ElementTree as ET
tree = ET.parse("test.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("test1.xml")
# 刪除node
for country in root.findall(‘country‘):
rank = int(country.find(‘rank‘).text)
if rank > 50:
root.remove(country)
tree.write("test2.xml")
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基礎知識之xml模塊