本文實例講述了Python實現的讀取/更改/寫入xml文件操作。分享給大家供大家參考，具體如下：

原始文檔內容（test.xml）：

<?xml version="1.0" encoding="UTF-8"?><framework>  <processers>    <processer name="AProcesser" file="lib64/A.so"      path="/tmp">    </processer>    <processer name="BProcesser" file="lib64/B.so" value="fordelete">    </processer>    <processer name="BProcesser" file="lib64/B.so2222222"/>    <services>      <service name="search" prefix="/bin/search?"        output_formatter="OutPutFormatter:service_inc">        <chain sequency="chain1"/>        <chain sequency="chain2"></chain>      </service>      <service name="update" prefix="/bin/update?">        <chain sequency="chain3" value="fordelete"/>      </service>    </services>  </processers></framework>

Python操作xml代碼：

# -*- coding:utf-8 -*-'''Created on 2018年8月30日@author: Administrator'''from xml.etree.ElementTree import ElementTree,Elementdef read_xml(in_path):  '''''讀取并解析xml文件    in_path: xml路徑    return: ElementTree'''  tree = ElementTree()  tree.parse(in_path)  return treedef write_xml(tree, out_path):  '''''將xml文件寫出    tree: xml樹    out_path: 寫出路徑'''  tree.write(out_path, encoding="utf-8",xml_declaration=True)def if_match(node, kv_map):  '''''判斷某個節點是否包含所有傳入參數屬性    node: 節點    kv_map: 屬性及屬性值組成的map'''  for key in kv_map:    if node.get(key) != kv_map.get(key):      return False  return True#---------------search -----def find_nodes(tree, path):  '''''查找某個路徑匹配的所有節點    tree: xml樹    path: 節點路徑'''  return tree.findall(path)def get_node_by_keyvalue(nodelist, kv_map):  '''''根據屬性及屬性值定位符合的節點，返回節點    nodelist: 節點列表    kv_map: 匹配屬性及屬性值map'''  result_nodes = []  for node in nodelist:    if if_match(node, kv_map):      result_nodes.append(node)  return result_nodes#---------------change -----def change_node_properties(nodelist, kv_map, is_delete=False):  '''''修改/增加 /刪除 節點的屬性及屬性值    nodelist: 節點列表    kv_map:屬性及屬性值map'''  for node in nodelist:    for key in kv_map:      if is_delete:        if key in node.attrib:          del node.attrib[key]      else:        node.set(key, kv_map.get(key))def change_node_text(nodelist, text, is_add=False, is_delete=False):  '''''改變/增加/刪除一個節點的文本    nodelist:節點列表    text : 更新后的文本'''  for node in nodelist:    if is_add:      node.text += text    elif is_delete:      node.text = ""    else:      node.text = textdef create_node(tag, property_map, content):  '''''新造一個節點    tag:節點標簽    property_map:屬性及屬性值map    content: 節點閉合標簽里的文本內容    return 新節點'''  element = Element(tag, property_map)  element.text = content  return elementdef add_child_node(nodelist, element):  '''''給一個節點添加子節點    nodelist: 節點列表    element: 子節點'''  for node in nodelist:    node.append(element)def del_node_by_tagkeyvalue(nodelist, tag, kv_map):  '''''同過屬性及屬性值定位一個節點，并刪除之    nodelist: 父節點列表    tag:子節點標簽    kv_map: 屬性及屬性值列表'''  for parent_node in nodelist:    children = parent_node.getchildren()    for child in children:      if child.tag == tag and if_match(child, kv_map):        parent_node.remove(child)if __name__ == "__main__":  #1. 讀取xml文件  tree = read_xml("D://test.xml")  #2. 屬性修改  #A. 找到父節點  nodes = find_nodes(tree, "processers/processer")  #B. 通過屬性準確定位子節點  result_nodes = get_node_by_keyvalue(nodes, {"name":"BProcesser"})  #C. 修改節點屬性  change_node_properties(result_nodes, {"age": "1"})  #D. 刪除節點屬性  change_node_properties(result_nodes, {"value":""}, True)  #3. 節點修改  #A.新建節點  a = create_node("person", {"age":"15","money":"200000"}, "this is the firest content")  #B.插入到父節點之下  add_child_node(result_nodes, a)  #4. 刪除節點  #定位父節點  del_parent_nodes = find_nodes(tree, "processers/services/service")  #準確定位子節點并刪除之  target_del_node = del_node_by_tagkeyvalue(del_parent_nodes, "chain", {"sequency" : "chain1"})  #5. 修改節點文本  #定位節點  text_nodes = get_node_by_keyvalue(find_nodes(tree, "processers/services/service/chain"), {"sequency":"chain3"})  change_node_text(text_nodes, "new text")  #6. 輸出到結果文件  write_xml(tree, "D://xiugai.xml")