Python的ElementTree的序列化错误写入磁盘

Question

当我解析在python

tree = ET.parse('existing.xml') 

添加一个文件在内存中的一些XML元素到XML结构

NodeList = tree.findall(".//NodeList") 

NodeList_WeWant = buildingNodeList[0] 

for member in aList: 
    ET.SubElement(NodeList_WeWant,member) 

写回磁盘

tree.write("output.sbp", encoding="utf-16") 

但我得到

Traceback (most recent call last): 
    File "runonreal.py", line 156, in <module> 
    tree.write("output.sbp", encoding="utf-16") 
    File "C:\Python340\lib\xml\etree\ElementTree.py", line 775, in write 
    qnames, namespaces = _namespaces(self._root, default_namespace) 
    File "C:\Python340\lib\xml\etree\ElementTree.py", line 887, in _namespaces 
    _raise_serialization_error(tag) 
    File "C:\Python340\lib\xml\etree\ElementTree.py", line 1059, in _raise_serialization_error 
    "cannot serialize %r (type %s)" % (text, type(text).__name__) 
TypeError: cannot serialize <Element 'BuildingNodeBase' at 0x099421B0> (type Element) 

编辑。错误的简单复制。见下面

我的基本XML

<?xml version="1.0" encoding="UTF-8"?> 
<family> 
    <person> 
    <id>100</id> 
    <name>Shorn</name> 
    <height>5.8</height> 
    </person> 
    <person> 
    <id>101</id> 
    </person> 
</family> 

的Python脚本

import xml.etree.ElementTree as ET 
from copy import deepcopy 

tree = ET.parse('basic.xml') 

root = tree.getroot() 

cloneFrom = tree.findall(".//person[name='Shorn']") 

cloneTo = tree.findall(".//person[id='101']") 

cloneTo = deepcopy(cloneFrom) 

ET.SubElement(root,cloneTo) 

tree.write("output.xml", encoding="utf-16") 

这种错误了

，这是我期待的Output.xml。应将个人节点克隆到另一个人节点并写回磁盘。

<?xml version="1.0" encoding="UTF-16"?> 
<family> 
    <person> 
    <id>100</id> 
    <name>Shorn</name> 
    <height>5.8</height> 
    </person> 
    <person> 
    <id>100</id> 
    <name>Shorn</name> 
    <height>5.8</height> 
    </person> 
</family> 

Answer 1

这里有一些问题：

• findall()返回一个列表，而不是一个单一的元素。
• SubElement需要一个字符串，而不是一个Element对象，作为第二个参数。
• id ='101'的元素不会被删除。

这里是代码为我的作品（与Python 3.6.1测试）：

import xml.etree.ElementTree as ET 
from copy import deepcopy 

tree = ET.parse('basic.xml') 
root = tree.getroot() 

remove = tree.find(".//person[id='101']") 
cloneFrom = tree.find(".//person[name='Shorn']") 

root.remove(remove) 
root.append(deepcopy(cloneFrom)) 

tree.write("output.xml", encoding="utf-16") 

这是与Output.xml的样子：

<?xml version='1.0' encoding='utf-16'?> 
<family> 
    <person> 
    <id>100</id> 
    <name>Shorn</name> 
    <height>5.8</height> 
    </person> 
    <person> 
    <id>100</id> 
    <name>Shorn</name> 
    <height>5.8</height> 
    </person> 
    </family>